Rosyfinch Ramblings
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April 2012
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Excitement at the rookery
Filed under: General, Birding & Outdoors, Florida & SE US, Birding "Patches"
Posted by: Ken @ 3:29 pm

We had high winds and driving rain overnight, as several thunderstorms passed through. I was concerned about the safety of the herons nesting in the rookery near our South Florida home, particularly in the trees defoliated by herbicide treatments that exposed their nests to the elements.

To keep track of the nests we have given them numbers, based upon their location relative to the row of ornamental Live Oaks planted on the bank of  the canal opposite the nests. We also designate whether or not the nest trees have been treated by herbicides (HT or non-HT). Nest #4 HT is occupied by the first pair of Green Herons, and the next 5 are those of Yellow-crowned Night-Herons. Nest 9 HT and 10 non-HT respectively have nestlings and eggs. Nest 9.5 non-HT is newly constructed and we have not yet seen any eggs. Nest 19 HT and 20 HT contain eggs.

Nest 22.5 non-HT (we call it the culvert nest because it is opposite a culvert) belongs to Green Herons that now have eggs. The male of the pair that occupy the culvert nest was very likely the same one that became entangled in fishing line and was rescued by Steve Siegel (see earlier post). It spent 3 days in rehabilitation and rejoined his mate. 

This morning, in between thunderstorms, I checked on the welfare of the herons. All the nests were intact. The chicks in the night-heron nest #9 HT were 2-4 days old.

The next wave of storms was approaching from over the Everglades.

Clouds over Everglades HDR 20120422

Green Herons have a 19-21 day incubation period. We first saw eggs in the Green Heron nest on March 25, when the pair exchanged incubation duties. This was probably within a few days of when they were laid, so we expected them to hatch around mid-April. The young may leave the nest as early as 16 days of age, but are weak fliers and depend upon their parents until they are 30–35 days old.

Green Heron pair exchanging incubation duty 3-20120325

We again saw the blue eggs on March 27.

Green Heron at nest with eggs HT tree 4 20120327

The female was still incubating on April 4…

Green Heron nest 4 HT 20120404

…and on April 10, when an adult was sitting very low on the nest.

Green Heron incubating Nest 4HT 20120410

On April 13 the parent was possibly brooding one or more nestlings, as it was sitting higher on the nest.

Green Heron on nest 4HT 2-20120413

We got our first look at the nestlings on April 15.

Green Heron chicks close-up 20120415

On April 18 we saw only three chicks.

Green Heron nest 4HT with 3 chicks 3-20120418

I made a video of the nest on April 19 (if not visible just below, click to view it here) and counted four nestlings.

Green Heron nestlings 7-9 days
from Ken
on Vimeo.

The smallest one must have hatched out a few days later than the others, as it was still downy. Note its soft gray coat and lack of pin feathers.

Green Heron chicks begging from mother 5-20120419

This morning, the smallest of the chicks was missing, probably blown off the nest, which is very flimsy and sways even in a slight breeze. When I arrived they were alert and seemed to be waiting to be fed, looking in every direction for a parent.

Green Heron chicks await feeding4 Nest 4HT 20120422

The Green Herons treated my neighbor Scott and me to a great show. I had watched them for about an hour as they waited to be fed. Only minutes after Scott joined me, the female parent flew in and quickly fed the chicks on the nest. She then walked to roost on a limb that led up and to the right of the nest. The chicks began to climb up towards her.

Green Heron chicks approach female parent2 Nest 4HT 20120422

Suddenly the male flew in and landed nearer the nest. He was immediately mobbed, first by the largest of the three nestlings.

Green Heron male arrives and is mobbed by chicks Nest 4HT 20120422

The largest chick fought violently with the adult, attempting to grasp his bill. They struggled so much that I expected the chick to fall off the branch into the water.

Green Heron male arrives and is mobbed by chicks2 Nest 4HT 20120422

The parent was surrounded by hungry little herons. They flapped and tussled.

Green Heron chicks surround male nest 4HT 20120422

The male herded the brood back into the nest, where he fed them in a more orderly manner.

Green Heron male leads chicks back to nest 4HT 20120422

Here is the culvert nest with the female sitting on the eggs.

Green Heron culvert nest female incubating 20120422

Successfully rehabilitated, the male parent foraged for insects in the grass just opposite the nest.

Green Heron culvert nest male 20120422

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