Snail & lichen in Ash tree

Snail & lichen in Ash tree

Observation - Snail & lichen in Ash tree - UK and Ireland. Description: Despite having seen snail trails on trees, I was nevertheless surprised to see a snail so far up in this Ash tree 9 ( maybe 15 foot up). the snail's s presence next to the Physcia lichen, suggests a high degree of pollution tolerance. However, not much li

Despite having seen snail trails on trees, I was nevertheless surprised to see a snail so far up in this Ash tree 9 ( maybe 15 foot up). the snail's s presence next to the Physcia lichen, suggests a high degree of pollution tolerance. However, not much lichen was present - presumably because of the density of the canopy which lets little sunlight in