https://ptes.org/my-garden/how-to-make-a-habitat-for-ground-nesting-bees/mason-bee-osmia-lignaria-peeking-out-of-its-wood-bore-nest-jennifer-bosvert/
Mason Bee (Osmia lignaria) peeking out of its wood bore nest Jennifer Bosvert - People's Trust for...
mason beeosmia lignariapeeking outwoodbore