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Scary Prehistoric 'Hell Pigs' Once Roamed the Earth
animals.howstuffworks.com/extinct-animals/prehistoric-hell-pigs-once-roamed-earth.htm
These super-frightening entelodonts (aka hell pigs) once patrolled throughout Eurasia, North America and Africa.
What's the largest land animal of all time?
animals.howstuffworks.com/animal-facts/largest-land-animal-all-time.htm
Just how big do animals come? Find out as we dive backward through history to unearth the largest land animal of all time.
10 Terrifying Extinct Cetaceans
animals.howstuffworks.com/extinct-animals/10-terrifying-extinct-cetaceans.htm
Extinct cetaceans are more like sea monsters, and can make nightmares seem dull. See these 10 extinct cetaceans to explore the ancient world.
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