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www.reference.com/pets-animals/crabs-breathe-6dfc3a1e29140888

For the crabs that do not have lungs, if the gills are kept moist, they can breathe just as well on land as they do in the water. This is why crabs like small, dark and moist hiding places when they venture onto land. Different types of crab have different gills and in different places, but they work in very similar ways.

www.quora.com/How-do-crabs-breathe-in-and-out-under-water...

Crabs can be divided into three broad categories: aquatic (mostly marine), intertidal, and terrestrial. Each type is able to live only in its own environment. Aquatic crabs have gills and breathe underwater like fish. Take them out of the water for too long and they will suffocate because their gills collapse.

www.answers.com/Q/Do_crabs_have_lungs

No hermit crabs have modified gills, which means that they do not need to be under water to breath.(Hermit crabs can drown in water) Instead sense they live in tropical climtes that are very humid ...

answers.yahoo.com/question/index?qid=20060628091847AA8pptE

They also have plates around their gills that protect them from losing moisture. Crabs that live on land live in cool, moist places so that they can breathe. They also drink water from the ground, or dew or water vapor, and can store it in their bladder or blood. They do not have lungs.

www.answers.com/Q/Do_crabs_have_gills

Do hermit crabs have lungs or gills or both? No hermit crabs have modified gills, which means that they do not need to be under water to breath.(Hermit crabs can drown in water) Instead sense they ...

en.wikipedia.org/wiki/Coconut_crab

Coconut crabs have organs known as branchiostegal lungs, which are used instead of the vestigial gills for breathing, and they will drown if immersed in water for long. They have an acute sense of smell, which has developed convergently with that of insects, and which they use to find potential food sources.

www.thoughtco.com/how-do-crabs-breathe-2291887

The length of time a crab can stay out of water depends on the type of crab. Some crabs, like coconut crabs and land hermit crabs, are terrestrial and breathe well without water, although they still need to keep their gills moist. As long as their gills stay moist, these crabs can spend their lives out of the water.

animals.mom.me/hermit-crab-lungs-gills-11110.html

Though your pet hermit crab is a land dweller, that doesn't mean he has a set of lungs. All hermit crabs have gills, whether they're aquatic or land hermit crabs, although land hermit crabs have smaller gills than their water-based relatives. Without the proper level of humidity, a hermit crab can suffocate.

owlcation.com/stem/How-Spiders-Breathe

Have you ever wondered whether or not spiders breathe? If so, have you ever wondered how their respiratory system works? Well, first, spiders do breathe. They just do not breathe like mammals and other animals do. They do not take a breath through their mouth like humans do but instead they breathe through their skin on the underside.

zippyfacts.com/how-do-crabs-live-out-of-water-on-land-and...

Crabs can be found in oceans all over the world, and many crabs in tropical regions live in freshwater and on land. They are usually covered with a thick exoskeleton, and armed with a single pair of claws. Crabs have gills to extract oxygen from the water like a fish, and do not have lungs.