DIURNAL animals prefer daylight to
carry out their many different activities.
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NOCTURNAL animals prefer nighttime to
carry out their activities. Nocturnal animals are endowed with
special characteristics that help their vision at night. They
have large eyes furnished with rods, a kind of cells that are
extremely sensitive to light, but do not respond to colors as
such. Some have very large pupils and special measures to close
the pupils in bright sunlight. They also have a reflecting tapetum
behind the retina, which reflects the light and strikes the rods.
Bats and shrews rely as well on their auditory and olfactory senses
to operate at nightfall. |
