in warmer temperate zones have a thinner plumage of feathers and fat layer than their counterparts of the polar species. To keep warm in near freezing waters, penguins have a highly developed heat exchanged system of blood vessels in the flippers and legs which helps the heat loss at the core of the body. To avoid heat loss in a penguins body, the penguin has 2 internal temperatures. A penguin has a normal body temperature and a temperature of the environment close to the limbs of the body. Tropical penguins can overheat very easily; so in order for them to lose the body heat, they usually use their flippers to get rid of excess heat. They also have bigger flippers than their polar penguin ancestors. Penguins communicate with each other by different ritual behaviors such as head and flipper waving, calling, bowing, gesturing and preening. Penguins communicate by displays or vocalization and performing physical behavior. They use many vocal and visual displays to communicate nesting and territories along with mating information. They also use displays in partner and chick recognition, and defense of intruders. (Sparks and Soper, 1987) Territorial disputes can lead to aggressive postures such as stares, pointing and even charging each other. Also during courtship and mating, other rituals are included which are called ecstatic displays. In these particular displays, an unattached male penguin will pump his chest several times, stretch his head upwards and move his flippers about away from his body. During this display, the male penguin also emits a loud harsh sound. In doing this, other male penguins in the colony begin to exhibit the same behavior which in turn begins the breeding cycle within the colony. When breeding occurs, one is unable to distinguish male and female penguins because they are not sexually dimorphic. There is one particular penguin that one can be told apart called the Crested penguin. Other ways of telling which ...
