Panther Chameleon

The Panther Chameleon (Furcifer pardalis) is a reptile in the Chamaeleonidae family. 

The male Panther Chameleon can vary in colour from blue to red, green, orange. The female is usually tan and brown with a bit of pink or orange. It has distinctive eyes, with a pin-hole where the pupil is located. Its eyes, with good eyesight, can rotate independently, giving the Panther Chameleon 360 degrees of vision (all around it). It has a very long tongue with a suction-capped tip to catch insects.

It has five toes on each foot, but some are fused together so it looks like it only has two toes on each foot: two together and three together. Its feet act like tongs and can grip branches. Each toe has a sharp claw. 

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What is an animal’s Arc of Vision?

What is an animal’s Arc of Vision? 

An Arc of Vision (AoV) is also known as the Field of View (FoV) or the Field of Vision (FoV) or the Visual Field. 

It is the view that an animal can see when its head, and the eye, are still. Can it see all around it – on all sides – or can it only see what is in front of it?

Monocular vision is what can be seen with one eye, and binocular vision is what can be seen with two eyes.

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Eurasian Eagle-Owl

The Eurasian Eagle-Owl (Bubo bubo) is a large, nocturnal bird of prey and a raptor. It is also known as the European Eagle-Owl. 

The Eurasian Eagle-Owl is heavily built with a large head, a grey facial disc, and tufted ears. It has tawny-brown feathers mottled with darker blackish feathers. It has freckling on the forehead and crown, and stripes on the nape, sides and back of the neck. Its wings and tail are barred. It has tufted feathers on its ears are called plumicorns. It has large orange eyes. It has feathered feet with sharp talons (claws). Its beak is dark-coloured. 

It can rotate its head, which gives it an arc of vision of 270 degrees. A human has an arc of vision of 120 degrees. 

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Northern Great Horned Owl

The Northern Great Horned Owl (Bubo virginianus subarcticus) is a nocturnal bird of prey and a raptor. It is also known as the Tiger Owl, the Hoot Owl, or the Subarctic Great Horned Owl. It is closely related to the Eurasian Eagle-Owl (Bubo bubo). It is not horned – the ‘horns’ are really tufts of feathers, called plumicorns. 

The Northern Great Horned Owl is well camouflaged at night with mottled brown-grey and white feathers. Some have more white feathers than grey feathers. It does not have the reddish colour of other sub-species of Great Horned Owls. It is heavily built with a large head, a grey facial disc, and tufted ears. It has large yellow eyes. It has feathered feet with sharp talons (claws). Its beak is dark-coloured. 

It can rotate its head, which gives it an arc of vision of 270 degrees. A human has an arc of vision of 120 degrees. 

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Sika Deer Eyes

A Sika Deer (Cervus nippon) has excellent vision. It can detect movement from a long distance away. 

A Sika Deer does not have a round pupil, like the pupil of a human eye. It does not have a slitted pupil, like the pupil of a domestic cat. 

A Sika Deer has an elongated pupil. It looks like a raisin, or a flattened grape. 

A full arc of vision is 360 degrees. A human has an arc of vision of 120 degrees (a human cannot see objects behind it). A Sika Deer has an arc of vision of 310 degrees, which means that it can see almost all around it. 

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