Definition of "trespasser"

Pilton Yard, the Lynton & Barnstaple headquarters, has been taken over by a fur trading firm, and would-be trespassers to the old engine-shed are turned back by the pungent odour of heaps of carcases.

1951 February, “Notes and News: Lynton & Barnstaple Remains”, in Railway Magazine, page 136

The human is a land animal, not an aquatic one, and he is therefore a trespasser in the water.

1983, Richard Ellis, The Book of Sharks, Knopf, page 16