Bumblebee
Asynchronous flight muscles

Bees beat their wings about 200 times a second. Their thorax muscles do not contract on each nerve firing, but rather vibrate like a plucked rubber band. This is efficient, since it lets the system consisting of muscle and wing operate at its resonant frequency, leading to low energy consumption. Further, it is necessary, since insect motor nerves generally cannot fire 200 times per second. These types of muscles are called asynchronous muscles and are found in the insect wing systems in families such as Hymenoptera, Diptera, Coleoptera, and Hemiptera. Bumblebees must warm up their bodies considerably to get airborne at low ambient temperatures. Bumblebees can reach an internal thoracic temperature of 30 °C (86 °F) using this method.
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