These species are less useful for gardeners and may affect helpful wildlife:

 

  • grey squirrels – destroy habitat, compete for food and eat eggs, fledglings and adult birds
  • rats – eat eggs, fledglings and steal food
  • rabbits – eat and kill plants, dig in gardens
  • magpies – actively target eggs and fledglings in nests, can kill adult birds
  • crows – target eggs and fledglings, can kill adult birds
  • jays – actively target fledglings, will eat eggs
  • sparrowhawks – require two sparrow-sized birds to eat per day (females will take larger prey)
  • herons – will eat fledglings and adults, may take eggs; eat fish and amphibians
  • deers – eat and kill plants
  • moles – burrow underground causing damage and molehills
  • cats – eat fledglings and adult birds, small mammals, amphibians, spiders and insects
  • aphids – can infest and destroy many plants
  • harlequin ladybirds – compete with native ladybirds for food – will also eat native ladybirds
  • lily beetles – can kill lily plants
  • slugs & snails – will eat any plants, especially tender species