We might wave to get someone's attention in a noisy crowd but one lizard prefers to do a workout. Anole lizards perform press-ups to turn a few scaly heads in the busy rainforests of Puerto Rico before beginning a display to show their status.
It is the first evidence of mute animals using visual displays to alert others to an imminent message.
The finding was made after Californian researchers built latex 'robo lizards' that could mimic the moves.
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