Nocturnal Animals.

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Presentation transcript:

Nocturnal Animals

What does nocturnal mean? This refers to animals that sleep during the daytime and are awake during the nighttime. They can be mammals or reptiles.

The Eyes Have it! Nocturnal animals have special pupils that help them see well at night. Their pupils can sometimes seem to “glow” when light shines on them.

The Pupils! Their pupils come in different shapes. Some pupil shapes are better than others at closing in bright light. http://www.pbs.org/wgbh/nova/kalahari/nightvision.html

A video on Nocturnal Cats World's Best: Series: Wild Cats. BBC. 2001. unitedstreaming. 17 September 2006 <http://www.unitedstreaming.com/>

Look at these eyes and see if you can guess the nocturnal animal they belong to.

Can you guess who I am? http://www.pbs.org/wgbh/nova/kalahari/nightvision.html

A Cuttlefish http://www.pbs.org/wgbh/nova/kalahari/nightvision.html

The cuttlefish is a cephalopod that buries itself in sediment by day and becomes active at night. The pupil of its highly sensitive eye, which sees as well as a human eye, is protected with a flap-like appendage that can close completely in bright light.

Can you guess who I am? http://www.pbs.org/wgbh/nova/kalahari/nightvision.html

A Fruit Bat http://www.pbs.org/wgbh/nova/kalahari/nightvision.html

Fruit bats are far from blind Fruit bats are far from blind. In fact, they rely primarily on their eyes for navigation -- unlike most bats, who navigate by echolocation.

Can you guess who I am? http://www.pbs.org/wgbh/nova/kalahari/nightvision.html

A Flying Gecko http://www.pbs.org/wgbh/nova/kalahari/nightvision.html

Geckos have eyesight comparable to a cat, giving them the best eyesight of all lizards. The flying gecko has an unusual scalloped pupil. When fully contracted, the pupil can close completely -- except for a few tiny pinholes where the scalloped edges do not quite meet.

Can you guess who I am? http://www.pbs.org/wgbh/nova/kalahari/nightvision.html

Pit vipers use two senses to better locate prey at night: sight and a heat-detecting ability. Deep pits, which lie on each side of the snake's face between the nostril and the eye, are capable of sensing the warmth given off by a human hand held a foot away. Heat and visual data are sent to the pit-viper's brain, where the two types of data are transposed into a single image of the prey.

Can you guess who I am? http://www.pbs.org/wgbh/nova/kalahari/nightvision.html

A Screech Owl http://www.pbs.org/wgbh/nova/kalahari/nightvision.html

So extraordinary is an owl's night vision, it can spot a mouse creeping through the underbrush more than a football field away on a moonless night.

Can you guess who I am? http://www.pbs.org/wgbh/nova/kalahari/nightvision.html

A Tarsier http://www.pbs.org/wgbh/nova/kalahari/nightvision.html

The tarsier of Southeast Asia has the largest eyes relative to body size of any living creature. The eyes are so enormous that they cannot be moved in their sockets. To compensate, tarsiers can swivel their necks 180 degrees in either direction. Though most nocturnal primates eat insects, the tarsier likes meat and has the vision, speed and reflexes to catch small prey in pitch darkness.

Nocturnal animals are fascinating!

Works Cited All pictures and information obtained from… NOVA Online http://www.pbs.org/wgbh/nova/kalahari/nightvision.html