Animals, like humans, depend on the sun. Natural light affects the survival, activity and distribution of animals, which is also the main information of the organism in order to measure the seasonal changes of the environment and produce corresponding responses. For thousands of years of animal evolution makes the sun and the moon and night stars emit light with extremely precise adaptability, change and alternation of day and night sun light intensity, has a decisive role in the control of growth and ecological characteristics of animal life. According to the different response to light can be divided into animal, animal diurnal animal (light animal), nocturnal animal (like dark animal), twilight animal and animal and four ecological types. 1 Diurnal animals. During the day, rest at night, can adapt to high light intensity. Like most birds and mammals in primates, ungulates, ground squirrels, woodchucks, squirrels, lizards and insects and reptiles of butterflies, grasshoppers, flies etc.. 2) nocturnal animals. Adapt to weak light intensity, nocturnal activity, daytime rest. Such as douroucouli, Rattus norvegicus, Apodemus and other mammals, birds of the Nightingale, night heron and other reptiles; house lizard, and isopods, cockroaches, insects, crickets and armyworm. It should be noted that nocturnal animals require weaker light intensity is relatively speaking, not the weaker the intensity of light, the better light, light will affect the normal life of these animals. 3) twilight animal. An animal that likes to engage in activities in dim light conditions before nightfall or dawn. Such as certain bats, hedgehogs, etc.. 4) all day and night animals. Refers to the 24 hours a day can be active, both to adapt to strong light can withstand weak light animals. Such as voles, sable, tussah etc.. All day and night activities and diurnal animals can undergo a wide range of changes in light quality, belonging to the broad light group. Nocturnal animal and animal crepuscular activity can only adapt to the relatively narrow range of light quality changes, belong to stenophotic groups. Almost all of the soil organisms and internal parasites are living in the shade.
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