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The Eryops became extinct in the 1400's.
Smaller animals
a frog
They ate animals smaller than themselves.
A lizard or in his own words ( A frog-like creature) maybe Mr.Henson was aware of the Eryops- a prehistoric amphibian about the size of well, a large alligator but with frog-like features. Eryops- it does sound funny, too.