# brain: actually they have heads that shrink ...

AA << followed the intra-individual change in skull size and body mass throughout the full cycle in wild recaptured shrews (Sorex araneus) >>

Using X-ray images [AA] << showed that individuals decreased the size of their braincases in anticipation of winter by an average of 15.3%. Braincases then partially regrew in spring by 9.3%. Body mass decreased by 17.6% and then dramatically increased by 83.4% in spring >>

Javier Lazaro, Dina K.N. Dechmann, et al. Profound reversible seasonal changes of individual skull size in a mammal. Current Biology 27 (20): R1106 - 7 doi: 10.1016/j.cub.2017.08.055

http://www.cell.com/current-biology/fulltext/S0960-9822(17)31093-X

These shrews have heads that shrink with the season. Oct 23, 2017

https://m.phys.org/news/2017-10-shrews-season.html