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There
is great value in observing nature rather than just reading about it.
In the case of Bald Eagles, one can find conflicting information, often
anecdotal, but probably valid in single instances. For example, it has
been said that when the chicks are almost ready to fly, the parents
begin to deprive the chick of food. The presumed survival advantage is
that the fattened chick will lose weight, and thus become more
proficient in free flight. It is also stated that the parent may "lure"
the chick out onto branches in an effort to get it to fly. We have seen
neither of these behaviors at our local Pembroke Pines, Florida nest.
They climbed out on branches of their own accord. Both of the chicks
fledged at approximately 11 weeks of age, just as expected. In the days
preceding their departure from the nest, we saw no decrease in the
number of feedings or the size or amount of prey items.
Hope
was joined on the nest yesterday by her younger nest-mate. Hope had
fledged on April 4, and Justice tested his wings two days later. Both
appeared to fall to the ground and there were fears they may had been
injured. In both cases, Florida Fish & Wildlife agents promptly
conducted searches of the nest area, but failed to find them. The
parents kept bringing food to the nest, instinctively luring the chicks
back. Driven by hunger, Hope returned to the nest site after 36 hours
and was on the nest April 6. That same morning, Justice went missing,
but suddenly flew into the nest tree yesterday, April 8, and later in
the day joined his big sister on the nest.
Yesterday,
Lou Greenwell, one of the watchers of our local Bald Eagle nest, called
me at around 7:40 AM to report that the younger chick, Justice, had
just flown off the nest and fallen to the ground. Only two days
earlier, Hope, the older eagle fledged and disappeared for 36 hours,
before suddenly returning the the nest tree. Mary Lou and I joined Lou
and Ed Mattis at the nest at about 8:10 AM.We were astonished to learn
that Lou had videotaped the entire episode! A beautifully edited
segment is posted on YouTube, and is embedded here.
Sunday,
April 5th has been a long and tiring day, but very rewarding. As you
may know, Hope, the older of the two neighborhood Bald Eagle chicks in
Pembroke Pines, Florida, suddenly left the nest at 7:30 AM yesterday,
April 4th. Hope was exactly 11 weeks old, the average age that eagle
chicks fledge. It was a great milestone in Hope's long journey into
life as an adult. Hope's first flight was very brief, consisting of a
couple of circles in front of the nest, then a dash to a nearby tree to
the southwest. She was said to have crashed rather audibly into the
upper branches, as if unable to purchase a grip, then dropped rapidly
straight down, not to be seen again. Mary Lou and I did not see the
event, having gotten to the site at about 8:00 AM, so we reconstructed
it from the descriptions of eye witnesses who had arrived before
sunrise to stand watch at the nest.
Anywhere
I have lived, there seem to be two lulls in the birding year. One is
after nesting season, when the songbirds molt and tend to hide away,
before the excitement of fall migration. The other happens around the
official beginning of spring. Some of the winter visitors have
departed, yet their places have not been filled by new arrivals. This
morning was a good illustration. As I walked our local patch, it was
nice to hear the cardinals and yellowthroats singing. A few Palm
Warblers lingered, most of them of the brighter eastern subspecies.
There
was an interesting interaction between the two eaglets this morning.
Hope turned 10 weeks old today. Justice is 5 days younger, but appears
disproportionately smaller. Hope appeared to wear herself out by
flapping and jumping high into the air. Once, she climbed about 3 feet
out on one of the branches that support the right side of the nest.
This seemed to tire her out, as she settled down out of sight. Justice,
as usual, "hunkered down" while the older chick was jumping and
flapping all over the nest. Earlier, we have even seen him passively
tolerate being stepped on by his big sister. Now, as soon as Hope
started snoozing, Justice decided it was his turn to exercise.
As
Bald Eagles adapt to the proximity of humans and their activities, what
are the limits of their tolerance to disturbance? Certainly (we
assume), there must be a limit, an end point at which they will
completely avoid us. Walk up to an eagle in the wild, and when we get
within a certain distance, it will first show signs of discomfort or
anxiety that we might detect. Its eyebrows cannot wrinkle into "worry
lines," because the bony structures of its skull give the eagle a
permanent fierce frown. It may exhibit other signs of intolerance--
first by staring at us intently, then shifting its posture in
preparation for flight, and perhaps by vocalizing, or even defecating
to make itself lighter. Then it will fly from its perch, removing
itself from the perceived threat. We could measure these behaviors in
large numbers of rural and urban eagles, and perhaps note a difference
between their reactions at various distances from the intruder.
The
eaglets are approaching a particularly dangerous time in their life
cycle, as they exercise their wings and even attempt to briefly lift up
into the air. Until they capable of free flight, they are at risk of
losing their balance and falling to the ground. Their parents cannot
fly through the trees to feed them, and even if they survive the fall,
they face almost certain death from the foxes, bobcats and raccoons
that congregate under the nest tree every night to find food scraps.
For the welfare of the eagle chicks, it will be important to
haveinformed eagle watchers present as much of the time as possible.
Most
of you know that we have asked the public to participate in selecting
the names for the two Pembroke Pines eaglets, from a list prepared by
students at Silver Trail Middle School. The results are in!
The polls just closed, and the two most popular names were HOPE and
JUSTICE. Commonly, there is one male and one female chick. Since
females are usually larger, we will arbitrarily call the older and
noticeably larger one "Hope," and her smaller sibling, "Justice." At
about 8 weeks of age, both chicks are nearly as large as their parents.
The
Florida Department of Transportation put these signs up yesterday,
prohibiting parking on the entire south side of the block in front of
the eagle nest. At this point, observers are still permitted, and signs
ask folks not to approach any closer to the nest. Visitors can either
park on the souths side of Pines Boulevard, east of 208th Avenue or
west of 209th. Alternatively, there is parking on the shoulder of the
north side of Pines Boulevard, across the street from the nest. Please
do not park on the pavement or in the turning lanes. Use caution in
crossing the street and control children.
The signs face out towards the street, so many people do not even
notice them. We suggest that additional signs should face the oncoming
traffic.
This
morning, a work crew extended a temporary orange plastic barrier fence
to the east and west from the chain link fence along the north boundary
of the 20 acre woodland that holds the Bald Eagle nest. They continued
around both corners, southward. The eastern side now is completely
closed off. The westward section closes off an area that had been used
by trespassers to access the nest site. This fence then continues to
the south into the area of dead melaleuca trees where the eagles like
to roost, discouraging foot traffic by trespassers who want to get
closer for a photo. Two prominent signs, in Spanish and English, were
placed at the viewing area. They do not prohibit parking, but advise
observers not to enter the area in front of the nest that is marked off
by traffic cones.
We
arrived at the nest at about 8:45 EDT, and found three other
photographers and observers already there. The said the chicks had been
fed at about 8:00 AM. We waited until 10:30, when one adult flew in
from the rear of the nest unnoticed by the 12 or so people that were
watching at the time. The adult proceeded to feed the fish to the young
birds. The older eaglet, who was seven weeks old this weekend, ate
first. At first, the smaller one looked on, but after its sibling had
eaten several large chunks, the adult began feeding it.
Yesterday evening,
Lynda White, EagleWatch Coordinator for Audubon of Florida,
accompanied by "Paige," a 14 year old non-releasable Bald Eagle,
completed a round of appearances in Broward County with a presentation
at Silver Trail Middle School in Pembroke Pines. In her
beautifully-illustrated talk before a large audience, Lynda reviewed
the natural history of the Bald Eagle, and provided many interesting
anecdotes about its life cycle. Following her presentation, members of
the audience gathered around to photograph Paige and exchange eagle
stories.
Plan
to attend the free presentation by Lynda White, EagleWatch Coordinator
for Audubon of Florida, at 6:30 - 8:30 PM this Friday, March 6, at
Silver Trail Middle School in Pembroke Pines. Lynda will be accompanied
by a "Paige" an adult Bald Eagle. She will speak about eagles in
Florida and the Pembroke Pines Bald Eagle nest. The program will be
held in the cafetorium of the Middle School, which is located at the SE
corner of NW 184th Avenue and Sheridan (18300 Sheridan
Street).Refreshments will be served. Be sure to bring your children and
a camera-- Paige likes to have her picture taken!
One
parent was roosting on the melaleucas to the west when I got there.
There were about 15 people at that end, and another 20 or so at the
nest site. All were enthusiastic and well-behaved. No one walked inside
the pylons, and no one brought pets. The adult then flew away to the
south, and only about 5 or 10 minutes later (about 1:30 PM) an adult
came in with prey. It looked like a long thin creature-- I thought too
fat for a snake, and too skinny and long to be a tilapia. Some said it
was a snake and others thought maybe an iguana. It was probably too
long to be one of the sirens that the herons like to catch. The adult
seemed to just drop it into the nest, and the chicks were not visible
as (if) they fed. then a little later it reached down into the nest..
The smaller chick was still on the left side, behind the adult. The
adult flew off after about 20 minutes. Both chicks then popped up and
the larger one did a lot of wing flapping.
While
standing watch at our local Bald Eagle nest in South Florida, visitors
offer many questions. Thrilled to see the two adults and their two
chicks at such close range, their curiosity is aroused and they ply me
and other eagle watchers with questionos. Since there is a steady
turnover of visitors, the same questions get asked over and over
again. My
attempt to limit them to a "top 20" list did not succeed, even when I
combined several of the questions. Readers may contact me with more
questions, which I will try to answer.
Yesterday,
many eagle watchers were alarmed because they only saw one eagle in the
area all day, from 8:30 AM (when they were fed and it was possible that
a second adult brought in the food), until late afternoon. A reporter
form NBC Channel 6 appeared on scene in the early afternoon, and
several people expressed their concerns about the "missing" adult,
fearing it had been injured or killed. I told the reporter that it was
too early to jump to such a conclusion, as the eaglets are fed much
less frequently, now that they can gobble down very large chunks of
prey.
On the early evening news, the reporter voiced these concerns anyway.
Then the second adult showed up and brought in prey at about 5:30 PM. I
notified him and, to his credit, he clarified this in the late news
show.
The
Painted Bunting is one of the most beautiful of our North American land
birds. The female is a splendid green, matched only by some parrots and
the Green Jay-- except for splashes of green on some other birds, such
as ducks, I can't think of any others so colored. The male is 'painted"
surrealistically in bright red, blue and green. It was one of Mary
Lou's most sought-after birds. She finally got a brief look at one in
Corkscrew Swamp this year.
This past Tuesday, we took a break from watching our local Bald Eagle
Nest and spent all day birding wetlands in western Palm County. We had
four "target" birds that we had seen previously, but really wanted to
get better looks and perhaps photograph them: Snail Kite, Limpkin,
Black-bellied Whistling-Duck, and Painted Bunting.
Quite
a few people are stopping by to look at the Bald Eagle nest and its
occupants. Visitors are asked to park in the grass, several feet away
from the pavement of busy Pines Boulevard. The eagles seem to be more
tolerant of vehicles than humans, so observers should avoid walking
towards the nest. Since the eagles can be disturbed by excessive
motion, eagle watchers should observe quietly and not permit children
to run about. The oldest of the two chicks (on the left in the above
photo) was hatched on January 17th, making it 34 days old today.
One
of the adult eagles displayed an interesting behavior this morning. It
swooped down over a nearby pasture and came up with some vine-like
greenery, which it brought to the nest and apparently left there. I had
witnessed this once before, and other eagle watchers mentioned seeing
the same thing happen. Then, after the eaglets had been fed, the adult
that had been brooding them flew to and Australian Pine, one of the
favored roost trees, and cleaned its bill. Then, it tore off a small
twig and returned to the nest, presumably with the twig, then
immediately left. I did not witness that the twig (or, earlier, the
vine) was actually deposited on the nest.
There
has been ongoing concern about installation, by the County School
Board, of traffic signal lights that would involve excavation and
construction within 200 feet of the nest, which now contains two
chicks.
Today, we received good news from the Florida Fish and Wildlife
Conservation Commission (FWC) that agreement has been reached with the
School Board to delay construction activity near the nest. Work within
330 feet of the nest tree will be postponed until the eagle chicks have
fledged, which should be some time in April.
Our
local Bald Eagles seemed not to mind the cold. The chick(s) are three
weeks old this weekend. Planned construction of a nearby traffic
signal, which will entail excavation only about 200 feet from the nest,
has not yet started. The Florida Fish & Wildlife Conservation
Commission (FWC) has provided consultation to the contractor in an
effort to minimize disturbance and possible nest abandonment, in the
event that the Broward County School Board decides to proceed with the
construction before the eaglets leave the nest. Since the Bald Eagles
have been removed from the Endangered Species List, they are protected
by State and Federal guidelines that recommend no unusual disturbance
within 330 feet of an occupied nest. These guidelines do not have the
force of law, and penalties occur only in the event that the eagles are
"taken" (which means it must be proven that the construction caused
them to be killed, injured, or abandon the nest).
Flocks
of up to over 100 rosy-finches of all three species are visiting Sandia
Crest, New Mexico. Keep an eye on the weather and road conditions
before setting out on the 13 mile climb to the top. Transmitters have
been placed on some birds. Check out the links in rosyfinch.com for
more information.
On
January 26, I accompanied a group of 7th grade science students on a
field trip to Flamingo Gardens, a private arboretum, preserve and
wildlife rehabilitation facility in Davie, Florida. These students are
studying the effects of traffic on the behaviour of the Bald Eagles
nesting only about 200 feet from a busy boulevard. They designed forms,
upon which they record traffic density and check off the various
actions of the birds, whether one or both of the adults are present at
the nest, their vocalizations, and any indications of nervousness or
avoidance.
I
have spent a frustrating, but educational, couple of days, learning
about how poorly various levels of government communicate with each
other.For those who don't know, we have a Bald Eagle nest in our
neighborhood, only about 215 feet from the edge of a busy boulevard.
They are the first pair known to have established an active nest in
Broward County since DDT was abolished in the 1970s. A row of orange
utility markers signal that construction is soon to take place, only
200 feet from the nest of a Bald Eagle nest containing a newly hatched
chick.
We
visited our local Bald Eagle nest this morning. Since the first egg was
laid on or about December 13, 2008, we expected it to hatch on or about
yesterday, January 17, 2009. Signs that an egg has hatched might
include any change in behavior. Also, after an eaglet hatches, the
incubating adult must continue to incubate any remaining egg(s), while
sheltering the new arrival, and do this without crushing or smothering
the helpless baby. Therefore, the parent will tend to stand a bit
higher
in the nest.
If
you have been following my journals, you know that I do most of my
birding
locally. Although field trips and seeing new and exotic species is
enjoyable, I have discovered that covering the West Miramar ESL
(Environmentally Sensitive Land) has its own rewards. This local patch
of recovering Everglades is within easy walking distance from our home,
and almost every visit provides a humble surprise.
This morning dawned cool and windless, promising ideal photography, if
I could find suitable subjects. Sure enough, after walking the quarter
mile on the gravel road, we turned into the first wooded area. To our
surprise, a beautiful Blue-headed Vireo flew right up to a tree right
in front of us. It disappeared almost as quickly, and I only had time
to click the shutter three times. The third view was a "butt shot" as
it made its exit.
Yesterday
morning, I saw a Bobcat again, at nearly the same spot as the smaller
one that I photographed the day before yesterday. I had been on a side
trail, photographing gnatcatchers and walked back to the main trail.
The cat was staring at me intently, and when I reached for my camera it
was gone in a flash. Its bulk was about twice that of a tomcat, with
longer legs. I believe it had been stalking a Common Ground-Dove, which
was frozen in one spot for several seconds, only about 10 feet from
where the Bobcat stood . On Sunday morning, we briefly visited Hugh
Taylor Birch State Park, next to the beach in Fort Lauderdale. Despite
its urban location, it is a remarkably quiet oasis of dry hammocks,
mangrove thickets and lagoons.
This
morning, we had chores to do, and I did not start my visit to our local
birding "patch" until about 10:00 AM. It was not very birdy, but just
about 200 yards into the path along the 198th Avenue Canal, I looked
back and saw what looked like a scrawny little feral house cat. Only
two days ago I had seen a much larger cat, about a half mile from that
spot, and it turned out to be a Bobcat. Looking through my 10x
binoculars, I could hardly make out any details, but I took three
photos anyway. About 5 minutes later, the cat crossed the the road, a
bit nearer. I did not bother to use the binoculars, but quickly took
one more photo. Only after looking at the photos at home did I identify
it as another Bobcat.
At
7:30 this morning it was clear and there was no wind, so I slathered on
the sunscreen and DEET in hopes of getting some good photos. My
destination was my local birding "patch," that begins on a gravel road
only a block from our South Florida home, and ends about a mile into
the West Miramar Environmentally Sensitive Land (ESL), a tract of
recovering Everglades, formerly grazing land, that our developer had to
set aside to mitigate the effects of draining and filling our
subdivision. My main objective was to photograph a Grasshopper Sparrow,
as I have seen three so far this month, but none provided me with a a
decent photo op.