The Mating Game

8pm, BBC One

David Attenborough narrates this insight into why freshwater environments are the stage for spectacular rituals and fierce competition. The start of South Africa’s rains sparks a battle between male giant African bullfrogs, while rare hooded grebes in Patagonia perform one of nature’s more comical dances to seduce their partner and a male cichlid fish builds a home for his harem from old snail shells.