Fledging strategies of Chestnut-headed Bee-eaters
There is a large colony of nesting
Chestnut-headed Bee-eaters in the confines of a large Buddhist temple complex on
Penang island. The birds have cleverly adapted to a man-made structure and nest
in drainage pipes on extensive retaining walls. There could be well over 100 active
nests in this relatively predator-free environment giving it a condominium-like appearance. The pipes are about a metre
long and the adult birds dig out a nesting chamber in the dirt at the inner end
of the pipes where the eggs are laid and the hatchlings are first fed..
Aerial view of the temple complex (terracotta colour) and the extensive surrounding forest. The retaining walls are indicated by the arrows |
Part of the retaining walls and drainage holes |
Choosing the condominium |
After choosing a location there may be the odd altercation with Crested Mynas
.......hunting is ongoing
..........and there are gifts for the partner
Up to 5 eggs are laid a day apart. In 20 days the chicks hatch and the parents will make numerous trips along the pipes to feed the hungry brood. All goes smoothly as the location has many flying insects that is their food source, captured by the parents in the air and conveyed into the chicks.
Combined images of an incoming adult with cargo |
The adults shuffle along the pipe with their cargo to the growing brood |
The adults will reappear up to two minutes later either head first, having enough room to turn around or tail-first where they complete a gymnastic flip before flying off for more hunting
The chicks mature in 28-30 days and are ready to
fledge (leave the nest fly for the first time). The oldest chick will go to the open end of the pipe and will
then intercept all the food coming in via the parents.
You can tell there is a chick near the entrance because the incoming adults stay on the outside of the nest entrance. The parents will rapidly stuff the ‘doorway’ chick with food…BUT he/she, now adult-sized, is preventing the feeding of the other chicks.
There may
be up to five adults feeding the nest and they have a two-pronged strategy to
clear the obstructing chick. COERCION or EXTRACTION.
With COERCION
the adults will fly in like they are on a feeding run but will veer off in
front of the chick …giving it a heavy hint. They will then fly in front of the
nest at a distance of 20-30 metres calling the chick. If the chick decides to
fly it will be greeted by the parents and escorted to a nearby tree. It will be
fed there by the parents for some time or in the adjacent area.
'Come fly with me' |
A chick flies for the first time...coerced from the nest by the parents |
If the blockading chick does not get the subtle
hint…. a less subtle method is used…EXTRACTION
The adult will fly in like on a normal feeding
run.
It will plant its dainty feet under the tunnel
entrance.
When the chick goes for the insect prey .......
The adult grasps the chick's beak..........
and pulls back.......extracting the chick like a pulling a tooth.
.....leaving the chick no alternative but to fly off.
The next mature chick will them come to the entrance in a short time and the whole procedure is repeated.
The whole event is over in the blink of an eye....to be precise at 10 frames a second and 6 consecutive frames ...there is 0.6 seconds of extraction action.
Couldn't be written any better. Reading this post reminds me of my old room mate! He always kept talking about this.retaining wall Wellington I will forward this article to him. Pretty sure he will have a good read. Thanks for sharing!
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Thanks for sharing the record, Graeme. It's really interesting. How long did the adult take for all mature chicks to be extracted?
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