Ladybug | San Diego Zoo Animals & Plants

One cute insect: A popular symbol of springtime is the speckled, miniature dome of a ladybug as it strolls along a plant stem looking for its next meal. They are also found in nursery rhymes and folklore around the world. Of all the creepy crawlies, ladybugs are the most beloved and respected of insects.

Lady "bugs" are a group of beetles that are also known as ladybird beetles or lady beetles. In fact, the name ladybug is a slang term for the more correct name, lady beetle. They are harmless to humans and are often considered cute by people who don't like other insects. Some people think ladybugs are a sign of good luck.

Ladybugs are small and usually quite round in shape. The color on the wing covers (elytra) can be yellow, orange, or red and often has small black dots on it. Some species are solid black. Ladybugs also have black legs, head, and antennae.

Like other insects, the ladybug has an exoskeleton made of a protein like the one that forms our hair and fingernails. Its body has three parts: head, thorax, and abdomen. Each of the three body parts has a different function.

The head houses the ladybug’s mouthparts, compound eyes, and antennae. The thorax has three pairs of legs and two pairs of wings. The first pair of wings is the hardened elytra that protect the flight wings underneath. When the ladybug takes flight, the elytra open, and the thin, veined wings unfold. The abdomen contains organs for digestion, respiration, and reproduction. Adult ladybugs breathe air, but the air enters the body through openings, called spiracles, found on the sides of the abdomen and thorax.

Ladybugs gather together in large groups to diapause (the insect term for hibernation). This helps them conserve resources and brings males and females together for reproductive purposes. Some ladybugs gather in logs, buildings, ground cover, beneath snow drifts, and even in houses! Millions gather in the southwestern United States, where they cover the ground like a blanket of red and black.

Ladybugs can survive for up to nine months by living off their stored reserves. They break out of diapause when the temperature reaches 55 degrees Fahrenheit (13 degrees Celsius). This is usually when food becomes available again.

Many ladybugs have bright colors to advertise to predators that they are not worth the effort! If disturbed, they can release a foul-smelling chemical from their "knees" to keep enemies away. Predators learn that color combinations of bright oranges, reds, and blacks can mean an unappetizing taste, and they avoid eating the ladybugs. This works so well that even ladybugs that are not distasteful mimic the colors of the poisonous ones.

Worldwide, ladybugs are seen as omens of good luck. In England, finding a ladybug means there will be a good harvest. In Sweden, if a ladybug lands on a young girl's hand, she will soon be getting married. Ladybugs are the official state insect of Delaware, Massachusetts, New Hampshire, Ohio, and Tennessee. How interesting that such a tiny insect can make such a vast difference in the world!