California sea lion (Zalophus californianus) female with monofilament net around her neck on Los Islotes, Baja California Sur, Mexico, North America

California sea lion (Zalophus californianus) with monofilament net around its neck on Los Islotes, Baja California Sur, Mexico, North America

California sea lion (Zalophus californianus) with monofilament net around its neck on Los Islotes, Baja California Sur, Mexico, North America

California sea lions (Zalophus californianus) with monofilament net around their neckst on Los Islotes, Baja California Sur, Mexico, North America

California sea lions (Zalophus californianus) hauled out on Los Islotes, Baja California Sur, Mexico, North America

Monofilament gill net on Marloes Sands, Pembrokeshire, Wales, UK, Europe (rr)

Young California Sea Lion (Zalophus californianus) with monofilament fishing line caught around its neck, Los Islotes in the Gulf of California (Sea of Cortez), Mexico.

Green sea turtle (Chelonia mydas) off Olowalu Reef on the west side of the island of Maui, Hawaii, USA. Notice the monofilament line caught between the left front flipper and the head of this turtle.