Category: Lakes


Underwater Fact 87

Otters have the thickest fur of all animals with at least 250,000 hairs per square inch. Some species have up to 1 million hairs per square inch.
They are the only known marine animals that are missing the “blubber” layer of fat under the skin. Their fur retains heat instead.

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Underwater Fact 84

Otters are the smallest of all marine mammals in the world.

An Otter can remain under water for up to 4 minutes with feeding dives up to 75m (250ft) deep.
These animals can consume up to 25% of their body weight daily. When a female is nursing she will consume even more than that. About 5 hours a day are spent in search of food.

 Sea Otter   © Sophia Volzke

Most species spend the majority of their time on land with one exception: the Sea Otter.

Sea otters have webbed feet, water-repellent fur to keep them dry and warm, and nostrils and ears that close in the water.
They sleep while floating on their back, often gathered in groups. Sometimes they anchor themselves in sea weeds or kelp to protect them from floating in a current.
Sea Otters are the only species that have more than one pup at a time which they also give birth to in the water. They hold infants on their chests to nurse them, and quickly teach them to swim and hunt.

Underwater Fact 78

The Diving Bell Spider (Argyroneta aquatica) is the only known spider in the world that lives entirely underwater. Like other arachnids, it must breathe air, so it creates a dome-shaped web between aquatic plants and fills the ‘diving bell’ with air carried from the surface.
They live almost entirely within the bells, darting out to catch prey that touches the bell or the silk threads that anchor it.

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Underwater Fact 50

Diving beetles can hunt for food underwater where land-living insects cannot compete.

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Underwater Fact 45

Although frogs have lungs, they absorb oxygen through their skin, and for this to occur efficiently, the skin must be moist.

Green Tree Frog   © Sophia Volzke

The common Australian Green Tree Frogs are often found around water sources inside houses, such as sinks or toilets. They are known to occupy tanks, downpipes and gutters, as these have a high humidity and are usually cooler than the external environment.

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Bull sharks are widespread coastal and freshwater sharks inhabiting shallow waters in bays, estuaries, rivers, and lakes. They have a unique ability to reduce or increase the saltwater concentration in their blood which enables them to penetrate hundreds of kilometres up rivers.

Underwater fact 36

Movember has come to an end and now it’s time to remember the most famous Mo-Stars of the underwater world:

Moustache Fish   © Sophia Volzke

#1 The Catfish’s barbels help it search for food in murky water.

#2 Antennae are the organs of touch and feel of a Crayfish.

#3 Male Mexican Mollys grow aesthetic moustaches to attract females.

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