Mammal

Mastodon

When: Miocene to Pleistocene
(11 million–12,000 years ago)
Where: North America
What: Mammal
Weight: 5 metric tons
Length: 3 meters
Diet: Herbivorous
Discovered: 1799

Paraceratherium

When: Oligocene
(34–23 mya)
Where: Asia
What: Mammal
Weight: 15–20 metric tons
Length: 8 meters
Diet: Herbivorous
Discovered: 1911

Saber-toothed Cat (Smilodon)

When: Pleistocene
(2.5 million to 10,000 years ago)
Where: North and South America
What: Mammal
Weight: 160–280 kg
Length: 1.6–2.2 meters
Diet: Carnivorous
Discovered: 1842

Woolly Mammoth

When: Pleistocene
(400,000–4,000 years ago)
Where: North America, Europe, Asia
What: Mammal
Weight: 6–8 metric tons
Length: 4 meters
Diet: Herbivorous
Discovered: 1799

Woolly Rhinoceros

When: Pleistocene
(3.6 million to 10,000 years ago)
Where: Asia
What: Mammal
Weight: 1,800–2,700 kg
Length: 3.5 meters
Diet: Herbivorous
Discovered: 18th century

Andrewsarchus

When: Eocene
(37–34 mya)
Where: Asia
What: Mammal
Weight: 1 metric ton
Length: 3.5 meters
Diet: Carnivorous
Discovered: 1924

Arsinoitherium

When: Eocene to Oligocene
(36–30 mya)
Where: Africa
What: Mammal
Weight: 2–3 metric tons
Length: 3 meters
Diet: Herbivorous
Discovered: 1902

Basilosaurus

When: Eocene
(41–34 mya)
Where: North America, Africa
What: Cetacean Mammal
Weight: 15–20 metric tons
Length: 15–20 meters
Diet: Carnivorous
Discovered: 1834

Gigantopithecus

When: Miocene to Pleistocene
(9 million–100,000 years ago)
Where: Asia
What: Mammal
Weight: 500 kg
Length: 3 meters
Diet: Herbivorous
Discovered: 1935