Ducks will only lay eggs early in the morning.
36
Hummingbirds can weigh less than a penny!
12
Cats recognise the voice of their owner, but never evolved to care.
22
Dogs sometimes fake being sick to get attention.
26
Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
2
Goldfish lose their color if they are kept in dim light or are placed in a body of running water, such as a stream.
12
When it comes time to give birth, the female shark loses her appetite so she won't be tempted to eat her own pups.
280
