Multituberculates, such as Hainina, Iberodon, and Kogaionon
Metatheres such as Didelphodon (a marsupial) and Alphadon
Eutheria, such as Montanalestes
Monotremes, such as Steropodon
And others.
about 15 years.
the cretacious. i probably spelled that wrong, well you know the period after the jurassic...
NO! It lived in the Cretaceous period, litteraly
since the Cretacious period
The gestational period for a mammal varies. Smaller mammals tend to have a shorter gestational period than larger mammals.
All mammals present today are example of tertiary period mammals as we are living in tertiary period .
Meerkats are placental mammals with a gestation period of around 70 days.
Highly unlikely. There may have been some species of Monotremes living contemporaneously with the dinosaurs, but it's unlikely that there were any like the platypus.
The African elephant holds the record for the longest gestation period among terrestrial mammals, lasting around 22 months.
The first birds appeared during the Jurassic period, around 150 million years ago. They are believed to have evolved from small theropod dinosaurs.
No, they're mammals. Mammals don't lay eggs (except for monotremes).
Mammals faced a series of ice ages.