Platypus: Example of Prototery Mammal
What they are - biological definition
The prototerias (Prototheria or Monotremata group) are oviparous primitive mammalian animals (laying eggs).
- The embryos of the prototropies develop inside eggs, therefore, outside the female's body.
- Have heart with 4 cavities (chambers).
- Fur covered with hair.
- They have a diaphragm.
- Females have mammary glands and therefore the ability to produce milk to feed the young.
- They are homeothermic mammals (have constant body temperature), ranging between 28 and 32ºC.
- They have 3 bones in the middle ear.
- Teeth are atrophied or missing.
- Echidnas (there are five species)
- The prototeries live mainly in Australia, Tasmania and New Guinea.
- Have a solitary behavior, looking for partners only at the time of mating.