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The nictitating membrane of a masked lapwing as it closes over the left eye, originating from the medial canthus. The nictitating membrane (from Latin nictare, to blink) is a transparent or translucent third eyelid present in some animals that can be drawn across the eye from the medial canthus to protect and moisten it while maintaining vision.
The parietal eye is found in the tuatara, most lizards, frogs, salamanders, certain bony fish, sharks, and lampreys. [7] [8] [9] It is absent in mammals but was present in their closest extinct relatives, the therapsids, suggesting that it was lost during the course of the mammalian evolution due to it being useless in endothermic animals. [10]
African dwarf frogs have eyes positioned on the sides of their heads, while African clawed frogs have eyes on the tops of their heads. African clawed frogs have curved, flat snouts. The snout of an African dwarf frog is pointed. African dwarf frogs are very active and rarely sit still for any period of time. When stationary, the African dwarf ...
Adult frogs do not have tails and caecilians have only very short ones. [69] Didactic model of an amphibian heart. Salamanders use their tails in defence and some are prepared to jettison them to save their lives in a process known as autotomy. Certain species in the Plethodontidae have a weak zone at the base of the tail and use this strategy ...
All geckos except those in the subfamily Eublepharinae (eyelid geckos) possess brilles. Some groups of bony fish have a transparent eyelid known as the adipose eyelid . [ 3 ] Some reptiles, mammals and birds have a translucent third eyelid that moves horizontally across the eye called the nictitating membrane .
The palpebral ossicles were small boney shingles embedded within the eyelid to protect the eye. ... which had a head about an inch in length (2.5 centimeters). But many frogs today have bodies ...
Agalychnis callidryas is an arboreal frog with long limbs and webbed toes. They mate and reproduce near ponds, and are therefore found in lowland wet areas found in tropical forests. [4] Like all the frogs in its genus, they are nocturnal and do most of their hunting for insects at night.
Frogs have no tail, except as larvae, and most have long hind legs, elongated ankle bones, webbed toes, no claws, large eyes, and a smooth or warty skin. They have short vertebral columns, with no more than 10 free vertebrae and fused tailbones (urostyle or coccyx). [ 47 ]