Factors Affecting Metabolic Rate

One of the most important factors that affects metabolic rate is the temperature of the organism, since within limits all chemical reactions of metabolism proceed faster at higher temperatures. The internal temperature of most invertebrate an imals, fish, and amphibians is the same as the temperature of the environment in which they live. Such organisms are called poikilotherms. In poikilothermic organisms, metabolic rate increases as the environmental temperature increases. Such organisms move...

Natural Selection In Snowy Owls

Pygmy Owl Catching Prey

Any of the Strigiformes, a group of birds with highly specialized characteristics for nocturnal activity, including soft feathers and enhanced hearing and eyesight. asymmetrical ears in some species of owls, the ears are of unequal size and located unequally on the sides of the head asynchronous an uneven event in hawks and owls, the staggered hatching of eggs that results in a nest of different-aged young facial disk the distinctive concentric circles of feathers that encircle the eyes of...

The Life Cycle of Hyenas

Hyena Life Cycle

There are similarities and differences in hyena species lives. Spotted hyenas form groups of up to The spotted hyena's maniacal, eerie cry has led to it being called the laughing hyena. Digital Stock one hundred a few males, many females, and numerous young. Females conceive year round, birthing two or three pups that can see and run immediately, after a four-month gestation. Females, larger than males, select short-term mates. Striped hyenas fight within groups, sometimes killing group...

Life Cycle of Chameleons

Exceptions include pygmy stump-tailed chameleons, which are small, ground-living, and lack prehensile tails. Male chameleons are territorial. In many cases, male invaders of a territory are fought actively and the battle ends in the death of one male. In some cases, the combat is ritual, though the male who is faced down leaves. Males and females are solitary, coming together only to mate. Most color changes indicate breeding intentions, pregnancy, or, on the part...