S4 have been studying the ecosystem and biodiversity. In studying the flow of energy through the ecosystem they have discovered that not all energy is passed along a food chain - some of it is lost- for example owl pellets contain bones fur etc that the owl can't use for energy so it discards it. To show this they dissected an owl pellet today, mice skulls and bones discovered! See if you can spot the teeth on the jaw bones and the hip bones.