This bird bioacoustics video is about Nuthatch, Sitta spp., feeding time in the nest. As with other newly hatched birds, the nuthatch babies are quiet until they recognize a parent, usually by the parent's call.
Here both parents are actively foraging for food and returning to the nest every minute or two, even though a storm is approaching, to feed their young. You will recognize the parent's call as they enter the nest cavity then hear the high pitch hunger squeal of the newborns.
I find it interesting that the baby nuthatches are instinctively quiet until they recognize their parent's call, and/or the shadow of the parent entering the next cavity although a response to a shadow could also be fatal as a shadow could be a predator too.
Lom MikroUsi microphones with a Sony PCM M10 and a waterproof drop bag. Microphones placed in the nest perimeter, away from babies but in the area of the parent bird's activity - hence the 'bumps'.
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