Star-nosed moles are blind and use the ultra-sensitive tendrils in their snout to navigate their way around. These moles spend the majority of their time underground, digging holes and hunting for prey.
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This animal is a relative of the salamanders. Atretochoanas use their skin to make sense of their surroundings as they lack eyes. They slither like snakes and don't need lungs to breathe.
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Sea Urchins have light-sensitive tissues in their skin that allow them to change colour according to incident light. The nerve endings connected to their skin form a visual system that helps sea urchins function without a pair of eyes.
Hydras are much like jellyfish and move using their tentacles. Hydras don't have eyes, but their capability of responding to light helps them carry out survival functions such as hunting.
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Japanese Swallowtail Butterflies have amazed zoologists with their ability to make sense of their surroundings without a pair of eyes. These butterflies have light-sensitive regions closer to their genital organs and perceive their surroundings from the rear end.