A Gelada Baboon, a grass-eating, baboon-sized primate that is the last of its genus, lives only in the Siemen mountains in the Ethiopian highlands. The male gelada has one chance in his lifetime to mate with females. Once he loses his dominant position, he will never get it back. A dominant male must mate with all females in the group to avoid being replaced.

Two gelada baboons. 'Theropithecus gelada', or gelada baboon, a grass-eating, baboon-sized primate that is the last of its genus, lives only in the Simien mountains in the Ethiopian highlands. The male gelada has one chance in his lifetime to mate with females. Once he loses his dominant position, he will never get it back. A dominant male must mate with all females in the group to avoid being replaced.

A young gelada baboon greets his father with a playful lip-flip, a sign of aggression in older males. 'Theropithecus gelada', a grass-eating, baboon-sized primate that is the last of its genus, lives only in the Simien mountains in the Ethiopian highlands. The male gelada has one chance in his lifetime to mate with females. Once he loses his dominant position, he will never get it back. A dominant male must mate with all females in the group to avoid being replaced.

Two gelada baboons. 'Theropithecus gelada', a grass-eating, baboon-sized primate that is the last of its genus, lives only in the Simien mountains in the Ethiopian highlands. The male gelada has one chance in his lifetime to mate with females. Once he loses his dominant position, he will never get it back. A dominant male must mate with all females in the group to avoid being replaced.

A male gelada baboon bares his gums in aggression. 'Theropithecus gelada', a grass-eating, baboon-sized primate that is the last of its genus, lives only in the Simien mountains in the Ethiopian highlands. The male gelada has one chance in his lifetime to mate with females. Once he loses his dominant position, he will never get it back. A dominant male must mate with all females in the group to avoid being replaced.

Group of gelada baboons. 'Theropithecus gelada', a grass-eating, baboon-sized primate that is the last of its genus, lives only in the Simien mountains in the Ethiopian highlands. The male gelada has one chance in his lifetime to mate with females. Once he loses his dominant position, he will never get it back. A dominant male must mate with all females in the group to avoid being replaced.

Three female gelada baboons bare their gums. 'Theropithecus gelada', a grass-eating, baboon-sized primate that is the last of its genus, lives only in the Simien mountains in the Ethiopian highlands. The male gelada has one chance in his lifetime to mate with females. Once he loses his dominant position, he will never get it back. A dominant male must mate with all females in the group to avoid being replaced.

Gelada baboons. 'Theropithecus gelada', a grass-eating, baboon-sized primate that is the last of its genus, lives only in the Simien mountains in the Ethiopian highlands. The male gelada has one chance in his lifetime to mate with females. Once he loses his dominant position, he will never get it back. A dominant male must mate with all females in the group to avoid being replaced.

Every evening at dusk the leading male in a gelada group puts on a ritual display to attract a chase by bachelor males. This is done to impress group females and assert his position. 'Theropithecus gelada', a grass-eating, baboon-sized primate that is the last of its genus, lives only in the Simien mountains in the Ethiopian highlands. The male gelada has one chance in his lifetime to mate with females. Once he loses his dominant position, he will never get it back. A dominant male must mate with all females in the group to avoid being replaced.

Jumping gelada baboon. 'Theropithecus gelada', a grass-eating, baboon-sized primate that is the last of its genus, lives only in the Simien mountains in the Ethiopian highlands. The male gelada has one chance in his lifetime to mate with females. Once he loses his dominant position, he will never get it back. A dominant male must mate with all females in the group to avoid being replaced.

Gelada baboon. 'Theropithecus gelada', a grass-eating, baboon-sized primate that is the last of its genus, lives only in the Simien mountains in the Ethiopian highlands. The male gelada has one chance in his lifetime to mate with females. Once he loses his dominant position, he will never get it back. A dominant male must mate with all females in the group to avoid being replaced.

Gelada baboon. 'Theropithecus gelada', a grass-eating, baboon-sized primate that is the last of its genus, lives only in the Simien mountains in the Ethiopian highlands. The male gelada has one chance in his lifetime to mate with females. Once he loses his dominant position, he will never get it back. A dominant male must mate with all females in the group to avoid being replaced.

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