Eggs Mammals Primates Whales 
10,000 Birds
JUNE 16, 2011
But that is because we often have the relationship between dinosaurs and birds reversed in our little primate minds; Much of what is bird-like is not exclusive to birds, but rather, to a larger group of dinosaurs. Among mammals, bipedalism is found in several rodents, a number of marsupials, and one primate.
10,000 Birds
JUNE 27, 2018
For example, you could say, “among mammals, only three families include species with a meaningful degree of root eating” or “within the family that includes lemmings and voles, there is a mixture of monogamous and polygynous species” and so on. That was useful, and it is still useful, even if there are often major exceptions. Think about it.
Expert insights. Personalized for you.
267 
Let's personalize your content