lol the first observation of my science fair lol, the gerbils in the wild habitat sheded and wove the hay into a soft warm nest. the gerbil sin the cage enviroment on th eotherhand, just lay down wherever they see fit! lol, th eother is that w=the wild ones are always on the move, and busy working and scavenging for food the other pair are so comfortable they hardly move, because there every whim is catered for, food served in a dish, soft warm bedding all over so they can just flop over, and if they care to get any exersize they will go to the wheel, and clib to the other levels, they apperently would much rather just lay there.