Mastodawn

The large tortoiseshell butterfly, thought extinct in the UK for over 60 years, is breeding again in southern England. Warmer springs allowed them to cross from Europe, and sightings are increasing from Dorset northward.
Read more: https://www.theguardian.com/environment/2026/mar/09/large-tortoiseshell-butterfly-no-longer-extinct-uk

Early spring sightings show colourful insect is a resident species for first time in decades, says conservation charity

The Guardian