TIL that certain mammels like weasels seasonally shrink their skull and brain to reduce heat loss during winter

https://royalsocietypublishing.org/doi/10.1098/rsos.160947
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1grb0mf/til_that_certain_mammels_like_weasels_seasonally/