A giant hollow tree is an interesting home to a large number of fruit bats. (drakebay.com)
Pickard says that honeybees use the magnetic field around them to align the parallel sheets of a comb when they build in darkness — in hollow tree trunks, for example. (newscientist.com)
Indie developer Hollow Tree Games announced today that their first person exploration game, Shape of the World, will be coming out later... (gamingtrend.com)