The earliest true beasts were insectivores (order) that appeared in the Cretaceous. After entering the Cenozoic Era, the eutherians differentiated from this basis and evolved at a very fast speed, resulting in a wide range of adaptive radiation. The first change in the history of Cenozoic mam...
1. Fairy Penguin, the cute little penguin, is only 33 centimeters or about 13 inches tall.fairy penguin2. The Dutch dwarf rabbit is the smallest rabbit in the world, with a body length of about 20-25 cm and a weight of 1-1.5 kg.Dutch dwarf rabbit3. The royal antelope is the smallest among the antelo...