Science

Monarch butterfly migration happens mainly in late summer and fall, when monarchs in eastern North America travel south to overwinter in the mountains of central Mexico. In spring, their descendants move north again over several generations; western monarchs generally migrate toward coastal California for winter. What “migration time” means There is no single day when […]

Mantis shrimp have unusually complex eyes, with each eye able to move independently and equipped with specialized visual structures. They can detect forms of light and color in ways that differ sharply from human vision, but the popular claim that they simply see far more colors than people is misleading. What Makes Mantis Shrimp Eyes

Chickens normally have two legs. A chicken uses these paired limbs to stand, walk, scratch the ground, and perch; its wings are separate limbs adapted mainly for balance and short bursts of flight. The Simple Answer The usual answer is two, whether the chicken is a chick or an adult, a hen or a rooster.

Birds procreate when a male’s sperm fertilizes a female’s egg, usually after the pair briefly brings their reproductive openings together in a behavior called the cloacal kiss. The female then lays an egg, and one or both parents commonly incubate it until it hatches and care for the chick, though the details vary widely among

The dodo went extinct after people reached Mauritius, an island in the Indian Ocean, and transformed the conditions on which the bird depended. Hunting contributed, but introduced animals and habitat changes also mattered; the extinction was not simply the result of people eating every dodo. What the Dodo Was The dodo was a large, flightless

Some hawks fly south for winter, but hawks as a group do not all migrate. Whether an individual hawk leaves depends on its species, where it breeds, the season’s food supply, and local weather. Why hawks migrate Migration is a seasonal movement between areas, often tied to breeding and access to food. Many hawks that

No, not all birds have nine air sacs. Nine is a commonly taught arrangement in many birds, but the number and development of air sacs vary among species, and the sacs are not the same thing as lungs. What Air Sacs Are—and Are Not Bird air sacs are thin-walled, expandable spaces connected to the respiratory

Different kinds of moths do not have one universal meaning: biologically, they are diverse insects, while symbolic meanings vary by culture and personal experience. A moth’s appearance can identify broad groups and suggest how it lives, but it does not reliably predict luck, death, or other events. What “meaning” can refer to The question “What

Mammals and reptiles are both vertebrates, but they differ in how they regulate body temperature, what covers their skin, and how they reproduce and care for their young. Mammals are warm-blooded animals with hair or fur and milk-producing glands; reptiles are generally ectothermic vertebrates with scales or scutes and a different pattern of reproduction and

Yes. Cows are mammals: they are warm-blooded vertebrates with hair, and females produce milk to feed their young. A cow is an adult female of domestic cattle, and both female and male cattle belong to the mammal class. What “cow” means In everyday speech, “cow” is often used for cattle in general. More precisely, a