I’m not sure if Ambondro mahabo is actually a “transitional fossil,” or if it was really as mean as it looks in this artistic representation, or if it was actually blue. It is kind of cute, though.
It is also a relative of the echidna and the platypus, and they’re cute in a weird sort of way.
Photo credit: By Alannis (Own work) [CC-BY-SA-3.0 or GFDL], via Wikimedia Commons.