Today in comparitve physiology we learned about how different animals respire in various ways. Most animals in the water breathe via gills. Gills are not well designed for respiration in air, but there are a few terrestrial organisms which breath through gills. One of these organsims is the coconut crab. Gills are essentially lungs that are not invaginated into the body. Instead they project into the environmental medium. There are both external and internal gills. Internal gills have a protective coating over them. There are also different typed of lungs. One type of lungs are diffusion lungs which respire air via diffusion and ventilation liungs which respire via tidal flow of air.
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