Category: Rivers


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 60

Unlike the majority of fishes, most tuna are endothermic, which means that their body temperature is kept higher than that of the surrounding water. This enables more efficient muscle action and faster swimming even in colder water.

View full article »

Underwater Fact 50

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

View full article »

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.

Copyright 2011 - 2015 Aqua Marine Life