Topics Land Booklet Habitat lossHabitat loss is one of the most serious threats to our ecosystems today. HibernationHibernation is a winter survival method that is more common than you might expect. ChoughsChoughs are beautiful playful birds, their inquisitive and intelligent nature means they have long been a part of myth and legend. River Booklet OttersOtters are a fascinating species that use both our fresh and salt water habitats, they offer us hope of how a threatened species can recover. Water cycleThe water cycle is one of the driving forces of our planet, reminding us daily that our resources are global. Invasive speciesInvasive species may be introduced into a habitat in many ways but their threat is always the same, they unbalance and add pressure to the local ecological systems. Sea Booklet StrandlineCreated as the tide turns, strand lines are what gets left behind by the sea at the highest point of the tide. Food chainFood chains are the basic building blocks of every ecological system. PollutionPollution can come in many forms and have far reaching global consequences.