The mating game. 4, Freshwater : timing is everything / produced & directed by Joe Loncraine ; a Silverback Film production for BBC, Discovery and NHK.
Freshwater covers only a tiny fraction of the earth's surface, but it is a vital meeting place for many animals - the stage on which millions gather to find a mate. Yet with so little of it available, and often only briefly, the challenge for most individuals is how to overcome intense competit...
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