The first big joint stocktake of animals and insects in the UK, has found that one in ten creatures could disappear.
The organisations involved have listed a number of reasons for this, such as the weather and changing habitats.
The hedgehog is one of the animals that is most at risk, their numbers have dropped by a third since 2000.
Rosslyn Colderly from Lancashire Wildlife Trust explains why this has happened and she tells Ricky that everyone can help their local wildlife flourish.
Read more: Half of UK wildlife in decline