Crabs are a kind of crustacean, and they are also a kind of animal that we see more often.Some characteristics of crustaceans are more prominent, such as breathing patterns.As crustaceans, crabs also breathe in the same way as most crustaceans, using gills to breathe.Crabs don't have lungs, so they can't use them to breathe.Lung is a relatively advanced respiratory organ, which is only found in more advanced animals.Generally speaking, reptiles, birds and mammals use lungs to breathe.Therefore, by means of breathing, crustaceans such as crabs can be distinguished from other animals that breathe with lungs.
As mentioned above, the respiratory organs of crabs are not lungs, they breathe with gills.In fact, one of the characteristics of crustaceans is that they use gills to breathe, and they do not have the advanced structure of lungs.As crustaceans, crabs also fit this profile.
The gills of crabs are distributed inside their bodies, that is, inside the hard shell, which looks white and filamentous.Crabs can store some water in their shells, so when they get to land, they can breathe for a while, so they can survive for a while.However, most of the places they stay are wet land, and they don't often go to very dry places.And if they spend too much time on land, they can cause breathing problems.Generally speaking, animals that breathe with gills can not stay on shore for too long.
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