Nature's Velcro. How a Swiss engineer turned a hiking… | by Medina County Park District | Medium
Burr seed hi-res stock photography and images - Alamy
9 Ways to Kill Sticker Burrs | Hunker
Fact sheet - Noogoora burr (471)
Sticky bur hi-res stock photography and images - Alamy
What is this burr sticking to my shirt? | Ask a Naturalist®
Bur parsley (Caucalis sp.): entire flowering and fruiting plant with separate flower, fruit and seed. Coloured engraving after F. von Scheidl, 1772. | Wellcome Collection
Bur clover (Medicago polymorpha) | Feedipedia
The Meanest Grass Imaginable – Jan Emming
Bleeding Heartland
MYSTERY PLANT: Mystery Plant spreads seed through burs | Features | postandcourier.com