InCanada,it’swinter.Red-sidedgartersnakesarehibernating.Thismeanstheyaresleeping.Theysleepingroups.Theystayundergroundtostaywarm.Inspring,itgetswarmer.Thenthesnakeswakeup.Theyleavetheirdens.Theyslitheroutoftheground.

Whatguidesthem?Theirsenseofsmell.Theypickupsmellsfromthegroundandair.Eachsnakeremembersthesmellofitssummerhome.Whentheseasonschangeagain,theyreturntotheirwinterdens.