I have been given a very small patch of ground at the school I work at. I'm very keen to grow things, but I also want to incorporate as much as I can to benefit wildlife. I want to create a log pile with the children, but I have been told that there might be a risk to the children. I'm aware that yews are poisonous, so I won't use that, all I want is to create a wildlife log pile to show the children the amazing creatures that will soon inhabit it. Advice please.