IN A WORLD where it pays to look after number one, the question of why animals are so nice to one another is fiercely contested. There are theories such as kin selection, which says that close relatives cooperate in order to perpetuate the genes they share. And researchers have found that among social animals, youngsters learn that it pays to go with the group.
Enter an intriguing experiment with a species of lizard that comes in blue, orange and yellow varieties. All can interbreed and have different breeding strategies. For example, if two blue males cooperate they improve their chances…
