Mammals are a group of animals that share three major traits. These traits help children understand how animals are sorted in nature and allow them to identify mammals in simple, observable ways. Are bears mammals? The first trait is that all mammals are warm-blooded. This means they can keep their body temperature steady, even when the environment changes. A squirrel in winter or a whale in cold water stays warm because its body regulates heat on its own. This is different f

When the days shorten and the air turns cooler, trees begin a transformation you can see all around you.