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Proconsul, an extinct ape, was discovered by Mary Leakey. This discovery provided important insights into the evolution of humans and apes. Proconsul lived in Africa around 20 million years ago and is considered an early ancestor of both humans and chimpanzees. Its skull, discovered by Leakey in 1948, revealed a combination of ape-like and human-like features, suggesting a transitional stage in human evolution.