Elephant shrews are one of the few species of mammals that menstruate.

Elephant shrew (by jboyles3)

Share +

turtleMales of some species of turtles and tortoises fight for mates by trying to flip the other one onto its shell.

Meet Our New Friend Ferb (by Suzanne Pyle Photography)

Share +

The dik-dik weighs 10-12 lbs (4.5-5.4 kg) and runs up to 26 miles (42 km) per hour. 

Dik-dik (by nick.lawes)

Share +

Whale sharks are the biggest living fish in the world, measuring up to 40 ft long and over 40,000 pounds.

(by jsintek)

Share +

94% of life on Earth is aquatic.

(by Jim Patterson Photography)

Share +

Jaguarundis, although feline, more closely resemble weasels.  They are not native to the United States but it is believed that there is a feral population in Florida.

(by Truus & Zoo)

Share +

Hummingbirds consume so much energy at their daytime body temperatures that they have to go into torpor (true unconsciousness) every night; otherwise, they would literally run of out energy and starve to death by morning.

(by Alfredo11)

Share +

Baby crocodiles (and alligators) will call from within the egg if they cannot break it open themselves, and their mother will gently break it open with her teeth.  She will then carry the baby to the water in her mouth.

(by Wee in YYC)

Share +

Aye-ayes are lemurs native to Madagascar.  Villagers consider them to be bad omens.

Share +

The kakapo is the world’s heaviest parrot.  It is also nocturnal, flightless, and highly endangered.

(by ZEALANDIA, Wellington, NZ)

Share +