The ferocity of the dawn chorus is hard to imagine, unless one is for example a town dweller unexpectedly in the countryside in May in Provence, with the shutters half closed and the windows open after a good evening's human conversation.
It is a loud sound and loud and complex in depth. First of all it is reverberant: woods are reverberant spaces especially to small sounds the size of a tree trunk. The bird and tree speak together. It is an acoustic map of the place : too complex to understand rationally, so complete that it is perfectly understood emotionally, the amount of life in nature.
Immensely three dimensional: resonant, capable of successive layered listenings, as though one could fix on one particular sound and drift to another and get a scale of distance and occupation of each.