It is someone who only eats meat or poultry. Basically a vegetarian that can eat fish and bird! I personally am a peskatarian, but I don't eat poultry.
You can eat fish some peskatarians eat dairy products and eat eggs, but mainly fish veggies and fruit. Like for me i eat fish,veggies,fruit,eggs(not fertilized), and i would die if i did not have dairy in my life i love milk.But don't eat any thing that has gelatin but you can eat kosher gelatin because its from the bones of deep water fish.
One type of animal that feeds on fish is a pelican. Pelicans are large birds known for their long beaks and throat pouches that they use to catch and swallow fish whole. They are often found near bodies of water where fish are plentiful.