grey squirrel - plague in pittencrieff park in scotland

130 acorns america american animal animals autumn balance biological brown carolinensis culling cute deciduous dunfermline eat eradicate exotic fauna fluffy food forest fur furry gray grey hazelnuts import introduced killing mammal mass meadow mixed nature neozone north nut parapox park pittencrieff plague pretty problem red rodent sciurus scotland smallpox squirrel squirrels survive tree virus wild years