David Attenborough's Natural Curiosities - Season 2 - Eps 9: Strange Parents
"Strange Parents" asks how we usually recognise animals as either male or female and how each sex normally plays a particular role in their own life cycle. However both hyenas and seahorses completely break the gender rules.
About David Attenborough's Natural Curiosities

Title: David Attenborough's Natural Curiosities
First Air Date: 2013-01-29
Last Air Date: 2017-06-25
Status: Ended
Rating: 7.156/10 (from 16 votes)
Language: EN
Seasons: 4
Total Episodes: 27
Network: Eden U&W
Genres: Documentary
Production Companies: Unknown
Synopsis
Sir David shines the spotlight on some of nature’s evolutionary anomalies and reveals how these curious animals continue to baffle and fascinate.
Cast

David Attenborough
Self - Presenter