One of the most common classifications divides the terrestrial aquatic animalsdepending on the environment in which they live. The distinction, in reality, is usually associated with the breathing mechanism, since terrestrial animals frequently incorporate oxygen from the air, while aquatic animals have gills to extract oxygen dissolved in the water. For example: squid, jellyfish, camel, wolf.
Aquatic animals
The aquatic animals They are those who depend on water for their subsistence, most of whom are capable of breathing in it. There are some, however, that despite being aquatic must come to the surface to capture oxygen.
In general, the physical build of aquatic animals is special and is associated with this need to live in that environment, since some have fins, others have basal discs or shells: this class of animals must have adapted to the environment of life in the sea, to the tides and to the different currents of water produced. The scales and pale blood are also forms of manifestation of this type of life, since they had to adapt to the different temperatures of the water.
Perhaps the class of animals most typical of the aquatic environment are fish, which do not need to get out of the water for any of their needs (rather, getting out of the water is what kills them). The enormous amount of fish in the world makes them a group in itself, belonging to the group of vertebrates with gills to breathe underwater. However, many of the aquatic animals are part of other categories, such as aquatic mammals or aquatic echinoderms.
Examples of aquatic animals
Squid Seal Dolphin Lionfish Sea Lion Sperm Whale Right Whale Common Ancistrus Blue Whale Electric Eel Jellyfish Gray Whale Sea Cucumber Cuttlefish Whale Shark Sardines Prawn Pilot Whale Manatee Common Trout Pearly Cyclic Octopus Blue-Ringed Octopus Bleeding Fin Tetra Archerfish Swordtail Snail Furry Frogfish Sunfish Great White Shark Herring Zebra Cichlid Sea Dragon Carp Swordfish Sea Turtle Cave Tetra Pufferfish Butterflyfish Lobster Goldmint Parrotfish Tuna Sea Pig Salmon Clam Coral Turbot Turtle Crappie Fish Oscar Fish Piranha Porpoise Flying Fish Firemouth Blue Shark Penguin Cod Necora Blue Acara Seahorse Mussel Salmon Starfish Orca Telescope fish Bearfish Sea urchin Surubí
Land animals
Living and moving on land or in the air is the main characteristic of land animals. This characteristic is what makes all the animals about which there can be doubts fall into the category of terrestrial animals: animals that live on land but spend much of their time in the water, or animals that live on land, belong to this group. insects or crabs that have an aquatic stage in their life cycle.
According to the science of the origin of species, terrestrial animals were not the first to appear, but rather they descended from aquatic animals.
There was, then, a transition from the possibility of living in the aquatic to the terrestrial environment (fossil evidence indicates that the first incursions on land made by sea creatures were about 530 million years ago). For a large number of animals, the possibility of living in the terrestrial environment was acquired during the Paleozoic or Mesozoic period, and for some less so during the Cenozoic.
Within the terrestrial category, a classification can be made by the type of food (between carnivores, herbivores, omnivores and frugivores), or a classification by the class of animal (between mammals, birds, amphibians, molluscs and echinoderms).
Examples of land animals
Camel Wolf Mole Hare Panther Chicken Cat Dog Tarantula Sheep Pig Iguana Buffalo Worm Raccoon Elk Scorpion Elephant Dromedary Deer Polar Bear Spider Rhinoceros Mule Orangutan Rat Cheetah Ostrich Leopard Gorilla Snake Goose Mouse Crocodile Tiger Anaconda Rooster Rhea Horse Penguin Goat Jaguar Cow Viper Beaver Frog Kangaroo Ham Donkey Lizard Calf Scorpion Baboon Armadillo Caiman Bear Chameleon Tortoise Widow Koala Squirrel Ant Donkey Giraffe Lion Monkey Monkey Bull
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