What instinctive defense mechanism dictates where wild Red Junglefowl roost at night?

Answer

They invariably roost high in the canopy of trees

Wild junglefowl invariably roost high in the canopy of trees at night as a defense mechanism against ground predators like wild cats or snakes.

What instinctive defense mechanism dictates where wild Red Junglefowl roost at night?
speciesbirdanimalstatusjunglefowl