Scientists have uncovered a worrying trend in 'shrinking' male sex organs in otters - and warn it could start be affecting human men too.
Research into the water mammal suggests that modern chemicals may be to blame for the alarming phenomenon of shrivelling organs.
A report by the Cardiff University Otter Project indicated the animal - one of Britain's best-loved predator species - is not in the rudest health.
Analysis found a decrease in the size of penis bones in male otters along with other changes that gave 'cause for concern' about the size of sex organs.
It questions if endocrine disrupting chemicals - also known as hormone disrupters - could be to blame.
And experts are warning the study could be behind similar problems in humans with increasing number of boys born with undescended testicles, sex organ malformation and reduced sperm counts.