British oaks are usually deciduous trees up to 30 metres tall with rough, fissured bark and broad spreading branches. Leaves have smoothly indented wavy margins, and the acorns are shed when ripe. If animals eat a large quantity of oak leaves or acorns then oak poisoning is likely. The most likely time for this is when grazing is scarce.
83p out of every £1 goes directly on donkey welfare and care