All Yesterdays: Protoceratops
The small ceratopsian Protoceratop, reconstructed as a tree climber, despite having no obvious adaptions for it (like goats).
All Yesterdays was originally a presentation I made at 2011 Symposium of Vertebrate Palaeontology and Comparative Anatomy in Lyme Regis. The central idea of the presentation was that prehistoric animals may have been stranger than we imagine, and to present some outlandish, but not necessarily wrong reconstructions. It is now a critically acclaimed book: