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42Evolution

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Can flies get drunk?

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Hexactinellid sponge (aka glass sponge) on a xenophorid gastropod (Image: Wikimedia Commons)

Can sponges see?

A dolphin mother calls to her calf using its unique signature whistle and teaches it to hunt. Male dolphins call each other’s whistle signatures when hunting. When meeting a new pod, dolphins call using their own signature whistles, as though announcing who is there. Whilst most mammals identify each other by scent, dolphins hold their breath when diving, so cannot use this sense. Instead these animals use signature calls (‘names’) to stay in contact with each other in low visibility conditions, and to strengthen social bonds between parents and offspring (Image: Wikimedia Commons)

Putting things into words

The dolphin calf is barely three weeks old.  His mother nuzzles at him, calling softly.  The calf responds, mimicking her…

These bright colour trails mark the tracks of stars, caused by the rotation of the earth. This time-lapse photograph was taken from the European Southern Observatory’s Paranal station in the high Andes, far away from any light pollution. These natural colours indicate differences in temperature; the reddest stars are around 1000C, whist the hottest stars at several tens of thousands of degrees, appear blue (Image: ESO/B. Tafreshi (twanight.org)/Wikimedia Commons)

Seeing red: for happy faces, or snakes in the grass?

We see red: dogs don’t. Our eyes emphasise contrasts, making it easier to spot colours, patterns, and rhythmical movements. But no two people see red in the same way. How has our vision evolved, and why?

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