Norbert Wu / Flamingo Tongue Snail (Cyphoma gibbosum) feeding on Common Sea Fan (Gorgonia ventalina) showing deep purple tone where the Sea Fan has released protective compounds, Saba, Caribbean

Tim Fitzharris / Peregrine Falcon (Falco peregrinus) adult in protective stance standing on downed duck, North America

Mark Moffett / Ant-mimicking Jumping Spider (Myrmarachne sp) on left, mimicking Green Tree Ant (Oecophylla smaragdina) to avoid predators, Cambodia

Fred Bavendam / Cardinalfish (Apogonidae) juveniles hiding among soft coral, Papua New Guinea

Matthias Breiter / Red-legged Kittiwake (Rissa brevirostris) nesting on cliff, Pribilof Islands, Alaska

Christian Ziegler / Misfit Leaf Frog (Agalychnis saltator) parachuting from the canopy to the forest floor, this behavior is thought to reduce predation risk

Hiroya Minakuchi / Two-banded Plover (Charadrius falklandicus) in broken wing display, Falkland Islands

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) adult rolled into protective ball, worldwide distribution, sequence 3 of 3

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) adult rolling into protective ball, worldwide distribution, sequence 2 of 3

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) adult rolled into protective ball, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) juvenile touching a young individual known as a manca that is rolling into a protective ball, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) adult, juvenile and young rolled into protective balls, worldwide distribution, sequence 2 of 2

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) adult rolled into protective ball, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) pair of babies, one responding to touch by rolling into a protective ball, worldwide distribution

Pete Oxford / Brazilian Three-banded Armadillo (Tolypeutes tricinctus) rolls into a protective ball when threatened, endemic to Cerrado and Caatinga habitats, Brazil

Pete Oxford / Brazilian Three-banded Armadillo (Tolypeutes tricinctus) rolls into a protective ball when threatened, endemic to Cerrado and Caatinga habitats, Brazil

Pete Oxford / Brazilian Three-banded Armadillo (Tolypeutes tricinctus) rolls into a protective ball when threatened, endemic to Cerrado and Caatinga habitats, Brazil

Pete Oxford / Brazilian Three-banded Armadillo (Tolypeutes tricinctus) rolls into a protective ball when threatened, endemic to Cerrado and Caatinga habitats, Brazil

Norbert Wu / Millipede (Tylobolus deses) coiled into a protective ball, has 300 legs, California

Tui De Roy / Spotted Eagle Ray (Aetobatus narinari) schooling in protective group, Galapagos Islands, Ecuador

Tim Fitzharris / Peregrine Falcon (Falco peregrinus) adult in protective stance standing on downed duck, North America

Tim Fitzharris / Peregrine Falcon (Falco peregrinus) adult in protective stance standing on downed duck, North America

Tim Fitzharris / Peregrine Falcon (Falco peregrinus) adult in protective stance standing on downed duck, North America

Tim Fitzharris / Peregrine Falcon (Falco peregrinus) in protective stance standing on downed duck, North America

Flip Nicklin / Polar Cod (Arctogadus glacialis) juveniles in protective shelter of cracks in the ice, Admiralty Inlet near Arctic Bay, Baffin Island, Canada

Fred Bavendam / Cavalla (Caranx sp) juveniles using a Blue Jelly (Catostylus mosaicus) as a shelter from predators, Andaman Sea, Burma