Avian clutch size of increasing clutch size with increasing latitude. The proximate and ultimate causes for this pattern have been a subject of intense debate involving the ideas of group and individual selection. David Lack observed a direct relationship between latitude and avian clutch size. Birds near the equator laid approximately half as many eggs as those that resided in northern temperate habitats. He observed an increasing clutch-size from the equator towards the poles (something he referred to as the “latitude trend”) for many passerine (perching) birds, near-passerine (tree-dwelling) birds and in various other groups: Strigiformes, Falconiformes, Ciconiiformes, Laridae, Ralliformes, Galliformes, Podicipedifomes, and
Angry Birds Fight! health, attack or defense depending the birds matched during the matching stages. If the players are able to match 4 of the same color panels that are same as their chosen birds, it will trigger Sabotage which will disrupt the opponent's gameplay. The Sabotage effect depends on the chosen bird of the players who triggers the Sabotage. If the players manage to match 5 matching color panels, FEVER TIME is activated where the player's attack and defense will be doubled for every matching panels. After matching, the Combat stage starts. The two birds will fight in arena with the stats