Valentine's Day: The interspecies relationships that evolved in natureValentine's Day: The interspecies relationships that evolved in nature External linkFrom bats and carnivorous plants to crocodiles and birds, nature is full of remarkable pairings that depend on each other to survive. A green-brown spongy sludge congregates en masse across the surface of the Everglades' shallow marshes in southern Florida.Tagsanimal intelligencecollaborationdependencemutualismrelationshipContent typeLINK