Are top carnivores always very large?

Top carnivores are not always very large; their size can vary depending on the ecosystem they inhabit and the availability of prey. In some cases, top carnivores may be large apex predators like lions or polar bears, while in other ecosystems, they may be smaller predators like weasels or falcons. The key defining characteristic of top carnivores is their position at the highest trophic level in the food chain, where they primarily feed on herbivores or other carnivores.