Dwarf elephants and shedding mammoths shine at NYC's 'Secret World of Elephants'

A woman and child look at the full-size model of a woolly mammoth with curly tusks at a museum exhibit.

After the dinosaur-killing asteroid struck Earth about 66 million years ago, it took only a few million years for the earliest known elephant relative to emerge.

This was the dog-size Eritherium, the earliest known proboscidean, which lived around 60 million years ago in North Africa.