<Table> <Tr> <Td> </Td> <Td> Look up crepuscular animal in Wiktionary, the free dictionary . </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> Look up crepuscular animal in Wiktionary, the free dictionary . </Td> </Tr> <P> Crepuscular animals are those that are active primarily during twilight (that is, the periods of dawn and dusk). This is distinguished from diurnal and nocturnal behavior, where an animal is active during the hours of daylight or the hours of darkness, respectively . The term is not precise, however, as some crepuscular animals may also be active on a moonlit night or during an overcast day . The term matutinal is used for animals that are active only before sunrise, and vespertine for those active only after sunset . </P> <P> The time of day an animal is active depends on a number of factors . Predators need to link their activities to times of day at which their prey is available, and prey try to avoid the times when their principal predators are at large . The temperature at midday may be too high or at night too low . Some creatures may adjust their activities depending on local competition . Therefore, for many varied reasons, crepuscular activity may best meet an animal's requirements by compromise . </P>

What are animals called that are active at dawn and dusk