Bronx rangers are on the hunt for a sicko who shoots darts at small defenseless creatures in Pelham Bay Park, authorities said yesterday.

A maintenance staffer at the Bronx wildlife refuge noticed several animals — two ring-billed gulls, a Canada goose and a squirrel — with darts stuck in their bodies last Tuesday, a Parks Department source said.

Those attacks follow an incident in which six birds were with darts in the Bronx park on Sept. 21.