These genetic findings reveal more than simply which came first. They also redefine relationships among placental mammals. For one, anatomists have always assumed that bats were in the same ...

They found that a small, furry, insectivorous mammal was the common ancestor of all placental mammals, including humans. Fossil evidence suggested that the group to which this animal belonged was the ...

These included the first fully aquatic mammals (whales ... and marsupial mammals thrived and diversified there, while placental mammals took over similar roles on the other continents.

If the Richs are correct, then our understanding of how placental mammals ... It is ironic that mammals actually got started about the same time as the first dinosaurs, around 230 million years ...

By contrast, strepsirrhine primates tend to have brain sizes that are essentially "average" for placental mammals of comparable body mass. Strepsirrhines as a group thus exhibit a range of ...