Guatemala ensures survival of vulnerable 'fossil' fish

In a freshwater canal surrounded by mangroves in southern Guatemala, hundreds of baby tropical gars—a torpedo-shaped fish with an alligator-like snout dubbed the "fossil fish"—are released into the wild.

Butterflies use optical illusions to dodge predators

A bird attacking a butterfly will often find its beak snapping at thin air. According to new research, that split-second miss isn't just bad luck. It's caused by a visual illusion from the butterfly's wings.

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