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Heliconia chartacea, Campanario, Costa Rica

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Entrance to a stingless bee nest in the base of a rainforest tree, Corcovado National Park, Osa Peninsula, Costa Rica.

Entrance to a stingless bee nest in the base of a rainforest tree, Corcovado National Park, Osa Peninsula, Costa Rica.

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Bull shark (Carcharhinus leucas) swimming in surf at the mouth of the Rio Sirena, Corcovado National Park, Costa Rica. This one was at least 3m long.

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Gull picking the eyeball out of a dead snook at the mouth of the Rio Sirena, Corcovado National Park, Costa Rica

Gull picking the eyeball out of a dead snook at the mouth of the Rio Sirena, Corcovado National Park, Costa Rica

Gull picking the eyeball out of a dead snook at the mouth of the Rio Sirena, Corcovado National Park, Costa Rica

Students using a large driftwood log as a sprinboard, Corcovado National Park, Osa Peninsula, Costa Rica.

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Erythrina sp. flower along the bank of the Rio Claro, Corcovado National Park, Osa Peninsula, Costa Rica

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Hummingbird on its nest, Sierpe, Osa Peninsula, Costa Rica

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Blue-grey tanager (Thraupis episcopus), Costa Rica.

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Blue-grey tanager (Thraupis episcopus), Costa Rica

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Fruit bat (Artibeus sp., probably jamaicensis) caught in a mist net at Campanario, Osa Peninsula, Costa Rica.

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Rock crab in the intertidal, Osa Peninsula, Costa Rica

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Blue morpho butterfly (Morpho amathonte), Campanario, Osa Peninsula, Costa Rica

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Rock arch on the beach at Playa Llorona, Corcovado National Park, Osa Peninsula, Costa Rica

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Little Hermit hummingbird (Phaethornis longuemareus) caught and released during mist netting at Campanario, Osa Peninsula, Costa Rica.

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Land crab (Gecarcinus quadratus) that lives in burrows in the forest at distances of about 0 - 200 m from the beach along the Pacific coast of Costa Rica

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Approaching the mouth of the Rio Sirena, Corcovado National Park, Osa Peninsula, Costa Rica

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Plaster casts of primarily cat tracks (jaguar, puma, ocelot, marguay) from the forest at Alberto Manuel Brenes Biological Reserve, Costa Rica.

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Silver-throated Tanager (Tangara icterocephala). Near San Isidro, Costa Rica. Spanish name is tangara dorada.

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Silver-throated Tanager (Tangara icterocephala). Near San Isidro, Costa Rica. Spanish name is tangara dorada

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Boa constrictor, Campanario, Osa Peninsula, Costa Rica

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Boa constrictor, Campanario, Osa Peninsula, Costa Rica

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Katydid on a hibiscus flower in the forest at Alberto Manuel Brenes Biological Reserve, Costa Rica

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Psychotria flowers (Rubiaceae) in the forest at Alberto Manuel Brenes Biological Reserve, Costa Rica

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Blunt headed snake (Imantodes cenchoa) where we found it on a roadside fern at night in Alberto Manuel Brenes Biological Reserve, Costa Rica. This arboreal snake eats primarily small lizards and frogs.

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Blunt headed snake (Imantodes cenchoa) where we found it on a roadside fern at night in Alberto Manuel Brenes Biological Reserve, Costa Rica. This arboreal snake eats primarily small lizards and frogs.

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