Oaks are vital the British countryside as they support the highest biodiversity of insect herbivores of any British plant. More than 400 different species of insect are said to rely on the Oak. Birds too, rely on the tree. One of the most obvious of these is the Jay (Garrulus glandarius) which harvests huge numbers of acorns, burying them as food store for the winter in much the same way as Squirrels do. Jays are thought to be the primary propagators of Oak trees in the UK.