All hollies produce a berry that sustains several species of birds during the harsh winter.
Although holly berries aren't poisonous to birds, they are toxic to humans.
As long as you aren't eating the berries, you
should be fine.
The toxic compounds are broken down in two stages, the heating stage of a compost heap starts the process then when the heap cools the fungi will come to life and take care of the rest of the breaking down of the holly berry toxin.
Redhawk