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Mammals

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Mammals
come in all shapes and sizes, and can be found all over the earth. There are around 5500 species of mammals in all. All mammals are warm-blooded and have either hair or fur on their bodies. The majority of all mammals give birth to live young, but there are a few species of mammals that lay eggs. The Triassic period, 220 million years ago, was the age that the first mammals can be found. Humans are mammals, but are not included on this site.

Mammal Information

Classification

 

   

Mammals Index

   A-M    N-Z
- African Forest Elephant - New Zealand Long-Tailed Bat
- African Leopard - North American Beaver
- American Badger - Northern River Otter
- American Pika - Okapi
- Angolan Giraffe - Pale-Throated Three-Toed Sloth
- Arctic Fox - Parma Wallaby
- Blue Whale - Platypus
- Bowhead Whale - Quagga
- Brown Garden Snail - Rocky Mountain Goat
- Cheetah - Sea Otter
- Chimaihuén (see Monito del Monte) - Sperm Whale
- Colocolo (see Monito del Monte) - Spotted Hyena
- Common Opossum - Sumatran Tiger
- Giraffe - Suricate (see Meerkat)
- Gorilla - Tiger
- Eastern Gray Squirrel - Warthog
- European Beaver - White-Cheeked Spider Monkey
- Gray Bat - White-Tailed Deer
- Grizzly Bear - Yak
- Hippopotamus - Yorkshire Terrier
- Indus River Dolphin  
- Jaguar  
- Kodiak Bear  
- Laughing Hyena (see Spotted Hyena)  
- Lion  
- Long-Eared Hedgehog  
- Manicou (see Common Opossum)  
- Marsh Mongoose  
- Meerkat  
- Merino  
- Monito del Monte  
- Mountain Tapir  
- Mountain Zebra  
- Muskrat  

Mammal of the Week

Platypus
 
The Platypus is native to Australia and Tazmania, and is a semi-aquatic mammal. They are one of five different mammals that give birth to eggs, instead of live animals.
 
Learn About the Platypus
  Platypus underwater

Mammal Background

During the Triassic period, about 220 million years ago, the first Mammal species were roaming the Earth. These mammal ancestors were preceded by a group called the 'synapsids'. There were three distinct groups of creatures prior to the Triassic period, of which 'synapsid' is one. The others are 'diapsids' and 'anapsids'. The terminology makes reference to the holes on their skulls where the jaw muscles attach. 'Synapsids' (mammals) have one hole on either side, 'diapsids' (dinosaurs, reptiles, birds) have two holes on either side, and 'anapsids' (turtles) have none.

 
 

         
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