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A firefly's glow is a chemical reaction, luciferin meeting luciferase, and almost none of the energy leaves as heat. Engineers call that cold light. The insect is not burning. It is signaling, usually for a mate, with a lamp that does not cook the lamp. Efficiency, in a backyard, is an old invention.

Firefly light is chemistry that wastes almost nothing as heat.

Bioluminescence · Encyclopaedia Britannica · Year unknown · Factapp

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The Arctic tern migrates from the Arctic to the Antarctic and back, a round trip that can exceed 70,000 kilometers in a year. No other bird is known to travel so far on the wing as a habit. The animal is the size of a hand. The route is the length of going around the planet, and then some, and then it does it again.

A small tern flies farther each year than any other bird we know.

Arctic Tern · All About Birds, Cornell Lab · Year unknown · Factapp

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