Nightingale & Canary - Bird sounds visualized by Andy Thomas
https://www.youtube.com/watch?v=NtIHJSRQvvk
(and I searched for more and found https://andythomas.com.au/pages/bird-sounds)
That is a snippet of birdsong from that video, plotted on time/frequency axes so you can see the structure of the call. Color denotes sound intensity at a given (time, frequency) region.
Nightingale & Canary - Bird sounds visualized by Andy Thomas
https://www.youtube.com/watch?v=NtIHJSRQvvk