It was from a small hut in Rwanda that researcher and conservationist Dian Fossey observed that while gorillas may sometimes act tough, they are really gentle giants.

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In 1956, the Columbus Zoo in Ohio became the home of the first gorilla to be born and raised in captivity.

While Snowflake may be gone, his legacy remains. In his time at the zoo, he fathered 21 gorillas, who have in turn given birth to 10 grandchildren, says Carme Mate, a primatologist in Barcelona who observed Snowflake for years.

For nearly 40 years an albino gorilla named Snowflake was adored by people around the world.

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The Congo Gorilla Forest at the Bronx Zoo in New York City replicates an African rain forest.

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Of the 4,000 or so species of mammals, only a handful of animals have ever been thought to mate for life.