Squirrel by Aaron Wildish
This cute chap has a block area of 4x larger than a silverfish with health points of 4 hearts .
He climbs objects as easily spiders and can jump twice as high as a human character in survival mode.
Squirrels are found in forests and jungles and can be bred as easily as any other Minecraft animal. They can be tamed by feeding them plenty of acorns.