Ernie Janes / Hedgehog (Erinaceus europaeus) rolled up on white background, captive, UK

Christian Ziegler / Spix's Disk-winged Bat (Thyroptera tricolor) pair roosting in rolled up Heliconia (Heliconia sp) leaf with the help of tiny suction cups on their wings, Smithsonian Tropical Research Station, Barro Co...

Christian Ziegler / Spix's Disk-winged Bat (Thyroptera tricolor) group roosting in rolled up Heliconia (Heliconia sp) leaf with the help of tiny suction cups on their wings, Smithsonian Tropical Research Station, Barro C...

Christian Ziegler / Pill Bug (Armadillidiidae) rolled up into defensive posture, Lambir Hills National Park, Sarawak, Malaysia

Mark Bowler / Three-banded Armadillo (Tolypeutes tricinctus) rolled up defensively. Captive. Endemic to Brazil. 1 of 6.

Nature Production / Common pill bug / woodlouse (Armadillidium vulgare) rolled up in ball, on white background, Japan

Doug Perrine / Reef manta ray (Manta alfredi formerly Manta birostris) with cephalic fins rolled up, being cleaned by Moon wrasses (Thalassoma lunare) and Blue-streak cleaner wrasses (Labroides dimidiatus) Hanifaru...

Murray Cooper / Cricket (Gryllidae) hiding in rolled up leaf, Amazon, Ecuador

SINCLAIR STAMMERS / Fossil of Flexicalymene meeki trilobite rolled up, Ordovician period, from the Richmond formation strata of Mount Orab, Ohio, USA

Doug Wechsler / Rolled oat grains (Avena sativa) close up, USA

Philippe Clement / Common piddock (Pholas dactylus) close up of shell showing the rolled-out hinge area, Normandy, France

Paul Hobson / Hedgehog {Erinaceus europaeus} rolled up for defense amongst autumn leaves, Peak District NP, Derbyshire, UK