Gerry Ellis / Blue Poison Dart Frog (Dendrobates azureus) secretes a fluid from its skin which is used by indigenous Indians to poison the tips of arrows, native to South America

Gerry Ellis / Jaguar (Panthera onca) fur, close-up of patterned detail, Washington Park Zoo, Portland, Oregon

Gerry Ellis / Ring-tailed Lemur (Lemur catta) group, Washington Park Zoo, Portland, Oregon, endemic to Madagascar

Gerry Ellis / African Lion (Panthera leo) male, portrait, Washington Park Zoo, Portland, Oregon

Gerry Ellis / African Lion (Panthera leo) male, Washington Park Zoo, Portland, Oregon

Kevin Schafer / Pacific Sea Nettle (Chrysaora fuscescens), Oregon Coast Aquarium, Oregon

Kevin Schafer / Pacific Sea Nettle (Chrysaora fuscescens), Oregon Coast Aquarium, Oregon

Gerry Ellis / Timber Wolf (Canis lupus) pups, 4-month old, howling, Oregon Zoo, Portland, Oregon

Michael Durham / Raccoon (Procyon lotor) getting into garbage at night, Portland, Oregon

Michael Durham / Raccoon (Procyon lotor) getting into garbage at night, Portland, Oregon

Gerry Ellis / Timber Wolf (Canis lupus) howling, Oregon Zoo, Portland, Oregon

Gerry Ellis / Hartmann's Mountain Zebra (Equus zebra hartmannae) close-up of tail and backside, Portland Zoo, Oregon