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 retail store somewhere in China, considered the game's fastest-growing market. Merchandise has been successful, with 45% of Rovio's revenues in 2012 coming from branded merchandise. The most notable toys are the Telepods, created by Hasbro. These figures are created for "Angry Birds Star Wars II", "Angry Birds Go!", Angry Birds "Stella", and Angry Birds "Transformers". Telepods use a similar digital toy hybrid concept as Skylanders or Disney Infinity characters, but there is a different technology behind it. These are figures used to "teleport" a character of the corresponding figure into the game by scanning a tiny QR code via the