heaveninawildflower:

Blue tits  (Cyanistes caeruleus) from the Canary islands (circa 1920).
Scanned from Amazing Rare Things: The Art of Natural History in the Age of Discovery
Henrik Grönvold (1858–1940)
Wikimedia
compendium-of-beasts:

Royal boa. (1802) 
via NYPL
scientificillustration:

Laotira
From: ‘Fossil Medusæ’ by Charles Doolittle Walcott. Published 1898