bmcbiol.biomedcentral.com

KYZ0Q TIL, unlike most birds, kiwis have horrible eyesight and are frequently prone to ophthalmological issues. As a result, they naturally rely so heavily on other senses that some have been found to have survived perfectly well albeit completely blind in the wild for years.
xV4X1 TIL that even though bigger animals have more cells (more cells=more mutations), they aren't more susceptible to cancer. It's called Peto's Paradox.