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In zoology, the diverse animals group that occupies the third trophic level of the food chain and can eat plants and animals is called omnivores.

Examples of omnivores include human beings, foxes, polar bears, giant pandas, insects, dogs, raccoons, turtles, woodpeckers, chickens, mice, chimpanzees, pigs, skunks, squirrels, and hedgehogs.

The characteristics of omnivores are adaptive digestive system, teeth to fix food like plants, digest macronutrients (fat, protein, and carbohydrate), and first or second-level consumer.

In carcinology, the type of large edible crab found in all marine environments across the globe and acts as a keystone species in the food web is called blue crab.

The physical features of a blue crab are five pairs of legs, a shell (body covering), a round body, bright-blue claws, and a sharp spine.

In the food web (food chain interconnection), the primary producers (clam and eelgrass) are eaten by the blue crab, whereas this blue crab is eaten by the consumers like human beings and Kemp’s Ridley sea turtle.

The blue crab is also considered a cannibal that eats other blue crabs or even itself. The level of the number of blue crabs species rises, whereas there is a reduction in the level of eelgrass due to the humans stopping feeding on the blue crabs.