Small audio recording devices were used to record bird songs in the forest around the clock. The photograph shows a lush, green forest and the view is up into very tall trees, looking up to the sky behind the canopies. There are no birds to be seen but there is a small, rectangular, dark-green device strapped round a tree trunk. Image thanks to David Singer who led this research.
A tiny, grey-brown bird with wide open beak perching at the top of a stump of wood with blurred yellow/green (likely) tree foliage in the background. The bird looks like it is singing at the top of its voice. Image of wren thanks to Kev (TheOtherKev) who made this image freely available via Pixabay
We know when the wild birds sing
Researchers used automatic audio recorders and AI to collect and identify detailed data about birdsong in European Forests. It turned out it was more than just larks and owls: www.uni-goettingen.de/en/3240.html...
#JournalOfOrnithology: doi.org/10.1007/s103...