Crabs

A:

Yes, crabs lay eggs. There are many types of crab, but their reproductive activities are similar. Female horseshoe crabs lay between 60,000 and 120,000 eggs.

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  • How do crabs breathe?

    Q: How do crabs breathe?

    A: The vast majority of crabs have gills, much like fish, which extract oxygen dissolved in water. Even when they are on land, the gills can still absorb oxygen as long as they are kept moist. There is also a small selection of land crabs that have dual-circulatory systems, meaning they have lungs as well as gills.
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  • How long do hermit crabs live?

    Q: How long do hermit crabs live?

    A: Hermit crabs kept as pets can easily live for over 10 years if cared for properly. One crab owner, Carol Ormes of Ft. Myers, Florida, kept a pair of crabs that lived to be over 30 years old.
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  • Do crabs lay eggs?

    Q: Do crabs lay eggs?

    A: Yes, crabs lay eggs. There are many types of crab, but their reproductive activities are similar. Female horseshoe crabs lay between 60,000 and 120,000 eggs.
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  • What do sea crabs eat?

    Q: What do sea crabs eat?

    A: Depending on the species, sea crabs eat plankton, worms, fish, shrimp and other crabs. Crabs that live in the deep sea survive on foodfalls, which are scraps of meat that fall to the ocean floor after being killed by another sea animal.
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  • How is a crab adapted to life on the seashore?

    Q: How is a crab adapted to life on the seashore?

    A: Crabs have several adaptations that help them survive life on the seashore, including antennae, funnel canals, claws and legs. These assist with eating, defense and hunting.
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  • What do ocean crabs eat?

    Q: What do ocean crabs eat?

    A: Most ocean crabs are considered carnivores and eat just about any meat they can find. There are a few species that are omnivores, however, and eat plants as well as meat.
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  • How do crabs protect themselves?

    Q: How do crabs protect themselves?

    A: Each crab species has its own features, but primary defense mechanisms for most include their hard shells and pincers. Their shells protect them against predators and rough elements. Crabs have tight grips with their pincers, which allows them to grab hold of predators and fend them off.
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  • Do crabs have brains?

    Q: Do crabs have brains?

    A: Crabs have a split nervous system that consists of a dorsal ganglion, which is the crab's brain, and a ventral ganglion. A circumesophageal ganglion connects the two parts. The crab's brain is situated between its eyes, while the ventral ganglion is underneath its organs and between its legs.
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  • What do hermit crabs eat?

    Q: What do hermit crabs eat?

    A: In their natural environment, hermit crabs eat decaying wood, grasses, plants, fallen fruit and things washed up on shore from the tide. Land hermit crabs are omnivores, meaning they eat both plant and animal matter.
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  • What is the largest type of crab in the world?

    Q: What is the largest type of crab in the world?

    A: The largest type of crab in the world is the Japanese spider crab. The males are larger than the females and can grow to be 12 feet across. Their bodies alone can reach 15 inches in width, and they can weigh up to 44 pounds.
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  • What is a baby crab called?

    Q: What is a baby crab called?

    A: A baby crab is called a zoea. Female crabs lay bunches of eggs in the water. Once developed within the egg, the larvae-like zoea hatches. Zoea are microscopic and must go through several stages before reaching adulthood.
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  • How do crabs mate?

    Q: How do crabs mate?

    A: Crabs mate in the early summer and in the fall. It is important for crabs to mate when the female crab has recently molted and her outer shell is soft. If the female's shell is no longer soft, the crabs are unable to mate successfully. Before the female molts, she releases chemicals that attract male crabs to come and mate with her while there is still enough time.
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  • What animals eat blue crabs?

    Q: What animals eat blue crabs?

    A: At each stage of life, blue crabs are susceptible to a different class of predator, though their most consistent predator is the human being. During the larval stage, blue crabs' most common predators include small species of fish and jellyfish. In their adult, developed stage, larger fish, birds and even many species of mammals will prey on blue crabs.
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  • Where do crabs live?

    Q: Where do crabs live?

    A: Crabs live in the water, which includes the oceans, rivers, lakes and ponds; most crab species are fond of freshwater. Crabs come in different sizes, ranging from a few millimeters to up to 12 feet. Even though they live in water, crabs sometimes venture to land, and certain species, such as the robber crabs, can even climb trees.
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  • Are sand crabs edible?

    Q: Are sand crabs edible?

    A: Sand crabs, like all species of crabs, can be eaten. Sand crabs are also called mole crabs, and while they are often considered ugly in appearance, they are crunchy and flavorful.
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  • How long do crabs live?

    Q: How long do crabs live?

    A: The lifespan of a crab varies according to species. A blue crab lives one to eight years, while a hermit crab lives 30 to 70 years. The Dungeness crab lives up to 10 years, and the horseshoe crab lives up to 20 years or more.
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  • Q: What do ocean hermit crabs eat?

    A: Ocean or marine hermit crabs are omnivorous and consume both plant and animal matter. They are opportunistic scavengers rather than hunters and prefer to eat algae and dead animals. In captivity, marine hermits function as tank cleaners by eating leftover food and detritus from the tank floor.
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  • Q: How do you take care of a hermit crab?

    A: To care for a hermit crab, buy a tank and substrate, provide two dishes of water, add climbing and hiding structures, keep track of the climate, feed the crab and clean the tank. Hermit crabs are easy to care for, but they require daily maintenance.
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  • Q: How long does a horseshoe crab live?

    A: Wildscreen Arkive indicates that the typical horseshoe crab lives between 20 and 40 years, though it is difficult for scientists to assess their ages. Males and females reach sexual maturity around age 10, and their slow growth process makes it hard to determine their age.
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  • Q: What are some hermit crab adaptations?

    A: Some of the most important and interesting adaptations the hermit crab have developed is its diligent exploration and occupation of gastropod shells. Unlike other crustaceans, the hermit crab does not have its own shell. Instead, it needs to find a shell to occupy to protect itself from aquatic and terrestrial predators that exist in an intertidal environment.
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  • Q: What do shore crabs eat?

    A: Shore crabs feed primarily on invertebrates such as molluscs, clams, crustaceans and worms, but they eat practically anything they can get a hold of, including the remains of dead organisms. Their voracious appetites have lead to the regional decline of several species. Shore crabs are an invasive species due to their easily accomodated diets and widespread dispersion.
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