Glyptodon
- When: Pleistocene
(2 million–10,000 years ago) - Where: South America
- What: Mammal
- Weight: 1–2 metric tons
- Length: 3 meters
- Diet: Herbivorous
- Discovered: 1839
Mammal
Livyatan
- When: Miocene
(9–8 mya) - Where: South America
- What: Cetacean Mammal
- Weight: 50 metric tons
- Length: 13–18 meters
- Diet: Carnivorous
- Discovered: 2010
Megaloceros
- When: Pleistocene
(400,000–8,000 years ago) - Where: Europe, Asia
- What: Mammal
- Weight: 700 kg
- Length: 3.5 meters
- Diet: Herbivorous
- Discovered: 1799
Megatherium
- When: Pleistocene
(2 million–10,000 years ago) - Where: South America
- What: Mammal
- Weight: 4 metric tons
- Length: 6 meters
- Diet: Herbivorous
- Discovered: 1796
Perucetus
- When: Eocene
(37–34 mya) - Where: South America
- What: Cetacean Mammal
- Weight: 200 metric tons
- Length: 17–20 meters
- Diet: Carnivorous
- Discovered: 2023
Uintatherium
- When: Paleocene to Eocene
(56–37 mya) - Where: North America
- What: Mammal
- Weight: 2 metric tons
- Length: 4 meters
- Diet: Herbivorous
- Discovered: 1872
