Hey #entomology BS, help!

Why are #springtails drawn to tracks in snow?

Noticed y'day backtracking after 20 min & can't find satisfactory answer.

If they come on top to feed on warm days, why do they then do this? Temp? Shade? Smell? Disturbance? Pitfall trap! 😉

🪲🐝🐜🐞🦗🕷🪳🪰🦟❄️👣 #bug #Collembolla