Several species of birds (of eg tit family) have a common chirpy language

There’s a kwirky 25 minute episode of Japanese nhk TV in ‘Darwin’s Amazing Animals’ series of Suzuki Toshitaka’s findings but only available till 5th of May;
direct link https://www3.nhk.or.jp/nhkworld/en/shows/4030076/
or the series Darwin's Amazing Animals | NHK WORLD-JAPAN
(It’s also interesting how Japan’s tit species (‘genus Parus’ pre2013 now in Paridae) look very similar to ours)
In autumn & winter they form mixed species flocks sometimes of 150
So a willow tit chirps dee-dee-dee= “gather” then flies to a pine tree to feed & the rest of flock follows
Other species have a different chirp for gather but they all know the others’ languages.
A Japanese tit’s high-pitched hee-hee-hee means hawk (at 7khz too high for a hawk to hear)
But they also have 2word sentences eg Pee-Tsu-Pee=be cautious,plus Jee-Jee-Jee (eg to mob a stuffed shrike)
Plus groups of tits taught their fledglings the words for a (stuffed) snake.
There’s more in
https://www.bbcearth.com/news/the-link-between-birdsong-and-language
and especially in
https://www.smithsonianmag.com/science-nature/do-birds-have-language-180979629/

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