Some land mammals have common ancestors even though they themselves evolved on different continents. The continents used to be connected and have moved further apart over time. More mammals were migratory a long time ago than they do in present day. All of the first mammal species were able to either swim or fly.
Some land mammals have common ancestors even though they themselves evolved on different continents. ... The continents used to be connected and have moved further apart over time. More mammals were migratory a long time ago than they do in present day. All of the first mammal species were able to either swim or fly.
