Birds don’t merely chirp to sing songs that sound pretty to the human ear; they chirp to communicate with each other. For some species, like the Eurasian jackdaw, their sounds are used to warn each ...

Jackdaws have distinctive calls that sound like “tchaw, tchaw” or “tchack, tchack.” nwinograd via iNaturalist under CC BY-NC 4.0 It is quite remarkable to witness hundreds, even thousands, of jackdaws ...