Sight And Survival Of Sight
Sight, for many people, is the one sense they feel would be the most difficult to live without. We
rely on sight to read, find our way around, cook our meals, do our jobs, and consume our
entertainment. For many animals, their sense of sight is of vital importance for their survival.
For example, hawks and eagles rely on their incredible vision to spot prey from the sky. Large
predatory cats, such as lions and jaguars, will use their improved night vision to hunt
unsuspecting prey in the dark. The loss of sight means almost certain death for a large amount of
animals, as sight is mainly used for awareness of surroundings, avoiding predators, and hunting
prey. However, this is not to say that some creatures do not rely on sight to survive; many animals,
such as shrimp and fish in low or zero light environments have not evolved to have a sense of
vision, but instead rely on other senses to understand their surroundings, find prey, or avoid
predators. Then again, sight is so important for survival on Earth that it has independently evolved
across multiple species1; this is known as convergent evolution. As Darwin puts it, the eye, such a
perfect organ, being formed by natural selection seems ...absurd in the highest degree ,1 but true
nonetheless. Sight is one of the greatest and most complex marvels produced by natural selection.
Cyanobacteria, microscopic prokaryotic bacteria, are known for their green colour, their ability to
convert sunlight into energy, with O2 as a
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