Next time you see a field of frolicking lambs in April or hear elk bugling on a crisp October night, remember: you aren't just seeing an animal. You are seeing a living clock. You are seeing millions of years of evolutionary calculation, perfectly tuned to the spin of our planet.
This internal mechanism is so precise that scientists have bred sheep in laboratories using artificial lights to make them breed in the spring, proving that it is the light, not the temperature, that flips the switch. seasonal breeders