Cool weather typically weakens muscle power in cold-blooded creatures  In the veiled chameleon, a cold-blooded animal, the speed at which the animal can retract its tongue declines dramatically as the temperature falls
However, the speed at which this chameleon can extend its tongue does not decline much as the temperature falls
In the veiled chameleon, tongue retraction is powered by muscles, whereas tongue extension is driven by energy stored in a rubber band-like sheath.