If you're short on time I recommend Great Art Explained in 15 Minutes. May not be exactly what you're looking for but the creator puts in a lot of work and you get to learn some really interesting things about art pieces and the artists who made them.
Hmm when you say flying in formation do you mean in like a cloud or a specific shape? If so could be starlings as they have a very varied repertoire of songs and can mimic other birds (which might explain why Merlin can't identify them)
When you say 'jagged wings' do you mean you can see the individual feather tips (like fingers)? Could be fish crows? The juvenile sound could be a little seagull-y?
Grackles are usually fully black apart from having lighter eyes. Some species flock together, and like starlings they also minic other birds.
Edit: one thing to note is Merlin doesn't always work well if you've turned GPS off on the phone. That might also interfere with identification
Not a Nokia and I can't find that exact model but it seems there were a couple of weird round phones floating around in the early to mid 2000's:
https://www.mobilephonemuseum.com/phone-detail/c800
https://www.mobilephonemuseum.com/phone-detail/xelibri-6
https://www.mobilephonemuseum.com/phone-detail/panasonic-g70
There were some other weird as hell designs around that period, like the ones in this article:
https://medium.com/@samworldpeace/nokia-made-some-of-the-weirdest-phones-ever-a7e3412fa0c0
I recognise all but one of the phones in that link. The time just before smartphones was a weird moment in mobile phone history.