Environment
Polar bear penis bone may be weakened by pollution
The baculum, a bone in the penis of polar bears, is losing density in areas where pollutant contamination is high – and that may spoil the bears' sex life
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The baculum, a bone in the penis of polar bears, is losing density in areas where pollutant contamination is high – and that may spoil the bears' sex life
They say size matters, but what of speed? In some lizards, penises have been evolving incredibly quickly – up to six times faster than other traits