Close-up image of an aquatic grousewinged backswimmer (Notonecta undulata) resting upside-down under the surface of the water
Side view of an aquatic damselfly nymph (or naiad) (Zygoptera species) resting on a submerged stone. These predatory larvae eventually emerge from the water as an adult damselfly
Darkfield image of a black planarian flatworm (Girardia dorotocephala) from a stream in Delta, British Columbia, Canada
Aquatic dragonfly nymph (or naiad) (Epiprocta species) clinging to an underwater stick and eating a 3-spined stickleback fish (Gasterosteus aculeatus) it captured
Pretty water boatman insect (Corixidae species) perched underwater on an aquatic plant. Delta, British Columbia, Canada
Dorsal view of an aquatic dragonfly nymph (or naiad) (Epiprocta species) that has captured a 3-spined stickleback fish (Gasterosteus aculeatus) to eat