Missouri has a great variety of birds because the state borders several different ecological zones, including the deciduous forest and the Great Plains. In addition, Missouri is part of a large eastern migration pattern that takes place through the middle part of the country. Carl Thompson age 11, Arnold Yes. Just like you, many wild mammals have two sets of teeth. The first set, called milk teeth, loosens and falls out when permanent teeth start to come in.
Milk teeth are small and unspecialized, but permanent teeth are adapted for the animal's diet.
For example, mammals such as rabbits and mice that gnaw and clip plant stems have large, chisel shaped incisors that continue to grow throughout lifetimes. Later, they use the same teeth to chew their cud, or regurgitated food. Other animals, such as shrews and bats that feed on insects, have sharp-cusped molar teeth that cut up the hard parts of their prey.