A large baculum, or penis, is critical for successful mating in an arctic climate, the researchers note, and even slight decreases may interfere with reproduction.

• 研究人员指出，一个大阴茎骨（或阴茎），对于要在北极天候下成功交配而言至关重要，即使微幅变小都可能妨碍到繁殖功能。