Hollins Vale contains two of Bury's fifty Sites of Biological Importance, first granted in 1981 owing to its biodiversity. The first is a portion of Hollins Vale's grasslands, which is home to a diverse range of waterside plants. The second is Hollins Plantation, a historic woodland containing bluebells, lesser celandines, wood speedwells, wood anemones, and violets. The reserve is also home to many species of wildlife such as linnet, reed bunting, snipe and grey partridge. The birds and small mammals attract predators such as kestrel, sparrowhawk, buzzard, tawny owl, weasel and stoat. Many species of butterfly are part of the ecosystem as is an increasing rabbit population. In the summer, significant populations of dragonflies and damselflys can be seen in the wetland areas.