Build a Nest Box for Bumblebees : 5 Steps (with Pictures) - Instructables
Beneficial Insect Nest Box – Bumblebee – MKW 3in1 – nest boxes and shelters for birds, bats and insects – nature protection with original boxes for wild animals on nestbox.eu
Bumblebee nest box designed by Nurturing Nature | nurturing nature
Deluxe bumblebee nest box and an unwelcome visit by a cuckoo! | nurturing nature