�y��vlog

Zoonomia demonstrated how some mammals have a very keen sense of smell - Hoffman's two-toed sloth, the nine-banded armadillo and the African savanna elephant - while others have almost none - whales and dolphins.

The nine-banded armadillo and Hoffmann’s two-toed sloth followed, while the Central American agouti came in fourth.

Some 60% of the world's largest rainforest – the Amazon – falls within Brazil's borders, containing unique and charismatic critters such as the giant anteater, two-toed sloth, and poison dart frog.

The tiny Linne's two-toed sloth "came into the world upside down" just over two weeks ago on 29 March.

Charlotte, a Linne’s two-toed sloth, is believed to be between seven and 10 months pregnant.