Australian Placental Mammals Only 2 Types of "Native" Placental Mammals in Australia


Placental Animals What is a Placental Animals?

Placental mammals constitute over 5,000 difference species of mammals such as humans, aardvarks, cats and horses. They were found all over the world except Australia.

All placental animals in Australia today arrived quite recently. The first to arrive was the bat which flew to Australia from the neighbouring islands. The first humans to inhabit Australia , the Aboriginals, introduced the dingo about 5,000 years ago. It was only with the arrival of white settlers in 1778 that large varieties of placental mammals such as cattle and sheep were introduced to Australia by these immigrants.

Placental (pla-cen-tal) pronunciation.

Characteristics of Placental Mammals

Placental mammals constitute over 5000 difference species of mammals and include animals as varied as humans, aardvarks, cats, horses and even whales.

Birth

The key characteristic of a placental mammal is that gives birth to babies that are far more advanced in their development than monotremes and marsupials. They do this by developing the baby inside their body in a uterus. The baby is attached to the uterus by an organ called a placenta which in turn is connected to the mother's blood supply. In this way the baby gets all the nutrients it needs to grow. The term "placental" is somewhat misleading because marsupial mammals also have a rudimentary placenta. The key difference is that in a placental mammal the baby remains attached to the placenta inside the mother's uterus for a relatively longer period of time compared to a marsupial. Placental mammals are sometimes called eutherian mammals to try to clear up this confusion. Because they have a uterus, placental mammals do not have a pouch.

Lactation

Placental mammals provide nourishment for their young by providing them with milk through a teat or nipple. Because the baby is already relatively well developed before it is born the period of lactation is much shorter than for equivalent marsupials.

Body Temperature

In general placental mammals have a body temperature of 38°C. This is about 3°C higher than most marsupial.

Metabolism

The basal metabolic rates (BMRs) of placental mammals is about 30% higher than marsupials.

Other

In general placental mammals have less teeth than marsupials. They also grow two pairs of teeth, namely milk teeth and adult teeth.

\


Our Other Fantastic Pages

Australian Animals

Australia has some of the most unusual animals .

View More

Great Barrier Reef

Located in Australia it is the world's largest coral reef.

View More

Australian Aboriginals

The Aboriginals were the first people to come to Australia.

View More

Australian Outback

The Outback is vast and breathtakingly beautiful.

View More

 Waltzing Matilda   

Waltzing Matilda is Australia's favorite song.

View More