Megazostrodon is an extinct Mammaliaform that is widely accepted as being one of the first mammals and which appeared in the fossil record approximately 200 million years ago. It did have some non-mammalian characteristics but they were sufficiently minor to warrant the analysis that this animal probably represents the final stage of the transitio...
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http://en.wikipedia.org/wiki/Megazostrodon
Megazostrodon was one of the earliest mammals . It was a tiny quadruped with a long tail, a long body, and a long snout. It lived from the late Triassic period through the early Jurassic period. This primitive mammal was about 4 inches (10 cm) long and weighed only a few ounces. It may have eaten insects. A complete fossilized skeleton was found in...
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http://www.enchantedlearning.com/subjects/dinosaurs/glossary/
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