How cephalopods see colour

Researchers from the UC Berkeley and Harvard University propose “colourblind” cephalopods may be able to see colour after all!

The father and son team Alexander and Christopher Stubbs, suggest octopus and cuttlefish use their large, wide pupils to accentuate the refraction of different wavelengths of light. They may be able to sense colour by bringing certain wavelengths into focus on the retina.

Click here to see the full journal paper.

Sea lion facts

Sea lions can hold their breath for up to 20 minutes. Unlike dolphins, sea lions exhale before diving. Their nostrils have special muscles to open them in order to breathe.

Sea lions can dive to depths over 250m, these animals have a high tolerance for carbon dioxide.The oxygen in their body concentrates in their heart and central nervous system rather than in non-vital organs. Their relative, the elephant seal, can hold its breath for 62 minutes and dive to depths over 1200m

Bizarre remora behaviour

While conducting fish surveys in The Solomon Islands, we were approached by several large remora ‘suckerfish’. Their distinctive first dorsal fins take the form of a modified oval, sucker-like organ with slat-like structures that open and close to create suction and take a firm hold against the skin of larger marine animals.

As far as we understand, the face first embrace captured in this video is never-before seen behaviour from these animals.

Electric File Clam

Found on tropical reefs in the Indo-Pacific, the electric file clam has soft tissues which flash light like a disco ball.

For years scientists believed the light was generated by chemical reactions known as bioluminescence, but recently scientists worked out the display actually comes from a rapid change from red to white tissue.

The white (silica) side reflects 85 to 90 percent of all white light when underwater. Dark and reflective sides are exposed at a rate of 2 times per second, creating the appearance of flashing, and may be to used to attract prey, or ward off predators.