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Recently came across this tweet https://mobile.twitter.com/teej_m/status/1489491830580264960 and I'm curious if these illustrations are public domain because of how old they are.

It seems most of them are engravings from the 19th century, so most definitely in the public domain.

In fact I'm a bit sad that they switched from these engravings to color drawings of animals recently...

The tarsier appears on the cover of some versions of a DJ Shadow album…