Arrange the players in pairs, facing each other holding the hands up and form a tree. The third player stands within the tree to represent a squirrel. There must be one extra player who is a squirrel without a tree. On the signal, all the squirrels must change trees and the homeless squirrel tries to get to a tree. This leaves another squirrel out and the game is repeated.
None
Any number of players (needs 3 minimum)
Make sure to explain rules clearly before starting. Divide players into equal teams for fair competition.