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Description
Two male Pelecobalaena gigas inflating their ventral pleats above the water in a show of strength. They can hold these at full capacity for upwards of an hour though it often takes less time. The individual who holds it the longest wins mating rights with surrounding females.

Description
Two male Pelecobalaena gigas inflating their ventral pleats above the water in a show of strength. They can hold these at full capacity for upwards of an hour though it often takes less time. The individual who holds it the longest wins mating rights with surrounding females.