Pachyrukhos

Pachyrukhos was an early mammal that filled a niche similar to the one that modern-day rabbits inhabit. Pachyrukhos was about 1 foot (30 cm) long. It had large ears and eyes, a pointed snout, a short tail, short front limbs, and well-developed hind legs. It probably moved by hopping. This mammal was probably nocturnal (given its large eyes and ears
Found on http://www.enchantedlearning.com/subjects/dinosaurs/glossary/
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