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| Figure 1. Spontaneous ejaculation by a wild Indo-Pacific bottlenose dolphin off Mikura Island, Japan.(A) Dense seminal fluid was ejaculated from the tip of the penis with initial contraction of the peduncle muscle downward. (B) A few seconds after the first ejaculation of seminal fluid, the remaining seminal fluid was ejaculated for 0.86 s |
Abstract
Spontaneous ejaculation, which is defined as the release of seminal fluids without apparent sexual stimulation, has been documented in boreoeutherian mammals. Here we report spontaneous ejaculation in a wild Indo-Pacific bottlenose dolphin (Tursiops aduncus), and present a video of this rare behavior. This is the first report of spontaneous ejaculation by an aquatic mammal, and the first video of this behavior in animals to be published in a scientific journal.
Morisaka T, Sakai M, Kogi K, Nakasuji A, Sakakibara K, et al. 2013. Spontaneous Ejaculation in a Wild Indo-Pacific Bottlenose Dolphin (Tursiops aduncus). PLoS ONE 8(8): e72879. doi: dx.doi.org/10.1371/journal.pone.0072879
