TIL smelt are naturally-occurring "GMOs": in the only known case of horizontal gene transfer between animals, they "stole" their gene for antifreeze protein from the very distantly related herring

https://www.cbc.ca/news/science/fish-horizontal-gene-transfer-1.5972546
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1gmomr7/til_smelt_are_naturallyoccurring_gmos_in_the_only/