Discussing the Shakespeare sonnet "That time of year" naturally made me think about the dawn chorus (of birds) and that led me on to something I'd forgotten about, the evening chorus (of fishes).
Fish can vocalize and on some coral reefs vast numbers of certain species "sing" at the same time of day. It's usually near nighttime and forms an underwater evening chorus. It may be related to feeding or reproduction, depending on the species.
Birds (and humans) sing according to the time of day (and year) but the singing behavior of some fishes is also affected by the phase of the moon.
More information is here.
Isn't that surprising? I wish I had been able to find a sound clip of fish singing but sadly not.
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