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For example, the cat's slit pupil can change the light intensity on the retina 135-fold compared to 10-fold in humans. [20] However, this explanation does not account for circular pupils that can be closed to a very small size (e.g., 0.5 mm in the tarsier) and the rectangular pupils of many ungulates which do not close to a narrow slit in ...
Image:Canada_blank_map.svg — Canada. File:Blank US Map (states only).svg — United States (including Alaska and Hawaii). Each state is its own vector image, meaning coloring states individually is very easy. File:Blank USA, w territories.svg – United States, including all major territories.
The South Indian states of Karnataka, Kerala, Tamil Nadu and Andhra Pradesh are home to nearly 44% of the elephants, 35% of the tigers and 31% of the leopards in India. [11] The state of Karnataka alone is home to 22% of the elephants, 18% of the tigers and 14% of the leopards in India.
Fossil specimens of tigers have also been reported from the Middle-Late Pleistocene of Japan. [44] Results of a phylogeographic study indicate that all living tigers have a common ancestor that lived between 108,000 and 72,000 years ago. [31] Genetic studies suggest that the tiger population contracted around 115,000 years ago due to glaciation.
The white tiger (ashy tiger) is a leucistic morph of the tiger, typically the Bengal tiger. It is occasionally reported in the Indian wilderness. It is occasionally reported in the Indian wilderness. It has the typical black stripes of a tiger, but its coat is otherwise white or near-white, and it has blue eyes.
The black skimmer has an additional adaptation and is the only species of bird known to have slit-shaped pupils. [ 4 ] the forehead, ends of the secondaries, tail feathers and under parts are white, the rest of the plumage is black and the basal half of the bill is crimson. [ 5 ]
English: A blank map of the United States, not including territories such as Puerto Rico and Guam. Uses the Albers projection. All paths of the states in the file have been assigned an ID consisting of their standard two-letter abbreviations in order to enable easy editing using a text editor.
In vertebrate eyes, the nerve fibers route before the retina, blocking some light and creating a blind spot where the fibers pass through the retina. In cephalopod eyes, the nerve fibers route behind the retina, and do not block light or disrupt the retina. 1 is the retina and 2 the nerve fibers. 3 is the optic nerve. 4 is the vertebrate blind ...