Embryos in eggs move to get comfy
Even before hatching, some reptiles and birds can shift toward favorable
![](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2014/02/sm_chickenegg_feat.jpg?fit=860%2C460&ssl=1)
SMART BLOB Embryos may not look as if they can do much, but new tests suggest that a lot of unfinished creatures, such as this unhatched chicken, can regulate their temperatures by moving to warmer or cooler zones of eggs.
Teng Li