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The first report of multiple, blind, wild birds in good health suggests vision is not necessary for the survival of kiwi.
Moore, B. A., Paul-Murphy, J. R., Tennyson, A. J. D., & Murphy, C. J. (2017, September 15). Blind free-living kiwi offer a unique window into the ecology and evolution of vertebrate vision. BMC Biology. BioMed Central Ltd. https://doi.org/10.1186/s12915-017-0424-0