Category: Sandy Beach


An invasive species of brittle star has the ability to reproduce asexually by self-division.

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Underwater Fact 91

Horseshoe crabs have existed in essentially the same form for the past 135 million years. Their blood is blue in colour and provides a valuable test that protect us humans from the toxins that cause septic shocks.

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Indo-Pacific bottlenose dolphins located in Shark Bay, Australia are thought to have a symbiotic relationship with sponges by doing what is called “sponging”. A dolphin breaks a marine sponge off the sea floor and wears it over its beak.

It is thought to use the sponge to protect its nose while feeling around for food on the sea bed which would make them the only known dolphins that use tools.

Bottlenose Dolphin –   © Sophia Volzke

Shark Bay in Western Australia is home to more than 3 000 Bottlenose Dolphins.

Each group consisting of mostly females has perfectly adapted their hunting methods to their environment.
The “sponging” Dolphins live in the deeper waters of the southern channel of Shark Bay. Other groups reside along the beaches and have developed a unique hunting technique for shallow waters. Their prey is trapped towards the beach while they use the surf to catapult themselves towards the shore. This behaviour is extremely unusual for Dolphins but effective enough to be passed on from mother to daughter over generations.

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Underwater Fact 82

Depending on the species, sea turtles may be carnivorous (meat eating), herbivorous (plant eating), or omnivorous (eating both meat and plants). The jaw structure of many species is adapted for their diet.

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Underwater Fact 80

The Killer Whale or Orca is the biggest member of the dolphin family.

It has the ability to track down its prey using echolocation and can chase down victims at speeds of up to 65 km/h (40 mph).
Groups of killer whales occasionally hunt co-operatively, forcing prey such as shoal of fish into shallow water to be caught more easily.
Orcas have even been known to breach the surf and snatch seals and other animals from the beach.

Underwater Fact 79

Developing Sea Turtle hatchlings do not have sex chromosomes so their gender is determined by the temperature within the nest.

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Underwater Fact 76

The largest kind of crustacean, the giant spider crab of Japan, measures up to 3.7 meters (12 feet) across between its outstretched claws. The smallest crustaceans, such as water fleas, can be smaller than  0.2 millimeter (1⁄125 inch) long.

A sea cow’s closest living relative is the elephant.

Manatee   © Carol Grant

There are four living species of Sirenians or so called “Sea Cows” that are categorized in two families: Manatees & Dugongs. View full article »

They can thrive in warm and cold waters, along coastlines or out in the deep. Their bodies are made up of around 95 percent water. Even though they have no brains, jellyfish have somehow been smart enough to survive for over 500 million years.

Blubber Jellyfish   © Samuel J Shelton

The Blue Blubber Jellyfish (Castostylus mosaicus) is common along the east coast of Australia from shallow seas to estuarine waters. Their recognized blue color comes from their symbiotic relationship with algal plant cells that are kept inside its body.

Underwater Fact 59

Over millions of years sharks and rays have evolved to become perfectly adapted to the ocean environment. However, some of the traits that have helped them become so successful have also made them vulnerable to human impacts.

Shovelnose Ray   © Sophia Volzke

The Giant Shovelnose Ray seems to be the visualisation of the fact that sharks and rays fall into the same class of species.

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