Caspian Tern was created in 1770.
Sterna caspia
Not really. They primarily eat fish.
This is a Tern. Three match your description but since you talk of a black plume, it is the Elegant Tern. Two others are similar- Royal and one other.
small fish
yes because they eat fish
nickolas horidiski
the same as other horses
bread guppies and weeds
They eat mainly fish and small marine invertebrates. - Wikipedia 17/10/09 [Aust]
We need location, size and behavior to be sure, but it is probably some sort of tern, possibly a Royal or Caspian.
people, cuz farmers kill them then they tern them into bacon then people eat the bacon.