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Its appearance is similar to the western, and eastern tiger swallowtails, but has narrower black stripes and usually two tails on each hindwing (rather than only one). Most two-tails have a black "slit pupil" in the orange eyespot on each hindwing, never present in western tiger.
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 ...
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.
[47] [49] The ears are rounded and the eyes have a round pupil. [47] The snout ends in a triangular, pink tip with small black dots, the number of which increase with age. [50] The tiger's skull is robust, with a constricted front region, proportionally small, elliptical orbits, long nasal bones and a lengthened cranium with a large sagittal crest.
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]
Humans, other primates, and dogs have round (spherical) pupils, which are useful for general all-round vision. Cats, snakes, crocodiles, and alligators have vertical slits which are useful for ...
The common belief that all albinos have pink pupils results in many albinos being incorrectly labeled as 'leucistic'. The neural crest disorders that cause leucism do not result in pink pupils and therefore most leucistic animals have normally colored eyes. This is because the melanocytes of the RPE do not derive from the neural crest.
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