Category: Fresh Water


Underwater Fact 156

Alligators are social creatures and often stay in groups called congregations.

Alligators are cold-blooded reptiles that can’t control their body temperature internally. To regulate heat they have to go for a swim to cool down or lie in the sun to warm up.

Image © Chris Gillete for ‘The Earth’

There are two different types of alligator, which vary in size. The American alligator lives in the southern United States and can grow up to 3.4 meters (11.2 ft) long and weight nearly half a ton (1,000 lbs. or 454 kilograms). Chinese alligators are smaller, growing to around 1.5 m (5 ft) long and usually weighing around 23 kg (50 lbs).
They are traditionally found in rivers, lakes, ponds and swamps, but are now confined mostly to ditches and ponds on agricultural land. Much of their habitat has been converted to rice paddies.

Underwater Fact 154

Female platypuses produce milk, but their mammary glands don’t protrude as nipples. Instead, they secrete milk much like our skin secretes sweat.

Baby Platypus   © Faye Bedford via LandLearn NSW

The Platypus is a unique Australian species. Along with echidnas, Platypuses are grouped in a separate order of mammals known as Monotremes, which are distinguished from all other mammals because they lay eggs.

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Underwater Fact 151

Spiny Gurnards feature large colourful fins and venomous spines that help searching for food.

Eastern Spiny GuarnardEastern Spiny Gurnard   © Klaus Stiefel

Gurnards, also called Sea Robins, are recognised by their beautiful large pectoral fins which they flap like wings, opening and closing them while swimming. This colourful display is mainly intended to distract predators.
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Underwater Fact 141

Bottlenose Dolphins give each other names by calling out to each other in individual whistling tunes.

Bottlenose Dolphin   © Flip Nicklin

Out in the pristine waters of Sarasota bay in Florida, scientists from Mote Marine Lab have spent the past thirty years studying the local residents – Bottlenose Dolphins.
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Underwater Fact 131

Unlike most fishes, the Australian Lungfish has the unique ability to breathe air using a single lung.

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Underwater Fact 130

Pygmy Geckos have water repelling skin that allows them to walk on water.

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Underwater Fact 126

Horseshoe crabs have ten eyes – the largest pair is used only for finding mates.

Horseshoe Crab – Vision   © Sophia Volzke

A quick glance at the horseshoe will show the crab’s two compound lateral eyes.
This is unusual because no other living animal from the Crab’s sub-family, Chelicerate, possesses compound eyes.
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Underwater Fact 121

A hippo’s sweat is bright red in colour and protects the animal from UV rays and infectious bacteria.

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Underwater Fact 119

Whirligig beetles have two pairs of eyes — one pair for looking underwater and one for looking above the waterline.

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Underwater Fact 116

The only known venomous mammal in Australia is the Platypus. It is an egg-laying mammal that spends most of its life underwater.
The Platypus is a true evolutionary survivor and has extraordinary skills from electroreception for orientation to a poisonous spine for defence and breeding purposes.

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