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http://www.biology-online.org/dictionary/Tertiary_consumer
a carnivore at the topmost level in a food chain that feeds on other carnivores; an animal that feeds only on secondary consumers. tertiary consumer in Science Expand.
http://www.dictionary.com/browse/tertiary-consumer
The trophic level of an organism is the position it occupies in a food chain. The word trophic derives from the Greek τροφή (trophē) referring to food or feeding. A food chain represents a succession of organisms that eat another organism and are, in turn, eaten themselves.
https://en.wikipedia.org/wiki/Tertiary_consumer
Organisms that eat the producers are known as primary consumers. These primary consumers are fed upon by secondary consumers, and the secondary consumers are then eaten by tertiary consumers. Quaternary consumers are often top predators within the environment, and they eat the tertiary consumers. Examples of quaternary consumers include lions, wolves, polar bears, humans, and hawks. Organisms may operate under different roles, such as a bear that eats fish but also berries.
http://study.com/academy/lesson/quaternary-consumers-definition-types.html
Within an ecological food chain, consumers are categorized into three groups: primary consumers, secondary consumers, and the tertiary consumers. Primary consumers are usually herbivores, feeding on plants and fungus. Secondary consumers, on the other hand, are mainly carnivores, and prey on other animals.
https://en.wikipedia.org/wiki/Consumer_(food_chain)
The number of steps an organism is from the start of the chain is a measure of its trophic level. Food chains start at trophic level 1 with primary producers such as plants, move to herbivores at level 2, predators at level 3 and typically finish with carnivores or apex predators at level 4 or 5.
https://en.wikipedia.org/wiki/Tertiary_consumer
Consumer (food chain) Consumers are organisms of an ecological food chain which receive energy by consuming other organisms. These organisms are formally referred to as heterotrophs, which include animals, bacteria and fungi. Such organisms may consume by various means, including predation, parasitization, and biodegradation.
https://en.wikipedia.org/wiki/Consumer_(food_chain)
Omnivores, who feed on both plants and animals, can also be considered a secondary consumer. Tertiary consumers, sometimes also known as apex predators, are usually at the top of food chains, capable of feeding on secondary consumers and primary consumers.
https://en.wikipedia.org/wiki/Consumer_(food_chain)
1 Level 2: Herbivores eat plants and are called primary consumers. 2  Level 3: Carnivores that eat herbivores are called secondary consumers. 3  Level 4: Carnivores that eat other carnivores are called tertiary consumers.  Level 5: Apex predators that have no predators are at the top of the food chain.
https://en.wikipedia.org/wiki/Tertiary_consumer
The efficiency with which energy or biomass is transferred from one trophic level to the next is called the ecological efficiency. Consumers at each level convert on average only about 10% of the chemical energy in their food to their own organic tissue (the ten-percent law).
https://en.wikipedia.org/wiki/Tertiary_consumer
tertiary consumers definition biology
The biology definition for Tertiary Consumers is that the carnivore at the topmost level in a food chain that feeds on other carnivores or an animal that feeds only on secondary consumers. As per the biology  tertiary consumers means a carnivore at the topmost level in a food chain that feeds on other carnivores; an animal that feeds only on secondary consumers.