The blue whale can reach 30 meters (100 feet) long and weigh as much as 180 metric tons (200 tons). The planet’s largest animal is a carnivore. Hypocarnivores such as bears are also considered omnivores. They eat meat, fish, berries, nuts, and even the roots and bulbs of plants. Most species of bears are hypocarnivores.
Hypocarnivores depend on animal meat for less than 30 percent of their diet. They also eat fruits, vegetables, and fungi.
Mesocarnivores depend on animal meat for at least 50 percent of their diet. Sea stars, which prey mostly on clams and oysters, are also hypercarnivores. All obligate carnivores, including cats, are hypercarnivores. Plants, fungi, and other nutrients make up the rest of their food. A hypercarnivore is an organism that depends on animals for at least 70 percent of its diet. Most carnivores are not obligate carnivores. All cats, from small house cats to huge tigers, are obligate carnivores. Plants do not provide enough nutrients for obligate carnivores. Their bodies cannot digest plants properly. Some carnivores, called obligate carnivores, depend only on meat for survival. Seals and sea lions are carnivores that consume fish, squid, and octopuses. Killer whales, or orcas, are a classic example of tertiary consumers. Carnivores that consume other carnivores are called tertiary consumers. Some eat omnivores, and some eat other carnivores. Carnivores and omnivores are secondary consumers. Herbivores, carnivores, and omnivores are consumers. Autotrophs are called producers, because they produce their own food. Omnivores, creatures that consume a wide variety of organisms from plants to animals to fungi, are also the third trophic level.
Herbivores, organisms that eat plants and other autotrophs, are the second trophic level. Autotrophs, organisms that produce their own food, are the first trophic level. Organisms in the food web are grouped into trophic, or nutritional, levels. Carnivores are a major part of the food web, a description of which organisms eat which other organisms in the wild. Organisms that carnivores hunt are called prey. Sometimes carnivores are called predators. A carnivore is an organism that mostly eats meat, or the flesh of animals.
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