Final answer:
Crabeater seals are carnivores that primarily feed on Antarctic krill, with specialized teeth for sieving their prey from the water.
Step-by-step explanation:
The crabeater seal primarily feeds on Antarctic krill and is therefore a carnivore. It has specialized teeth that allow it to sieve krill from the water. Although crabeater seals are named as such, they do not typically eat crabs. Due to their feeding habits, they play a significant role in the Antarctic food web, impacting the populations of their krill prey and consequently influencing the ecosystem they inhabit. Crabeater seals are an example of the varied diet within carnivorous organisms and the specialized features that enable them to exploit specific niches within their environment.