Adrian Davies / Cape Sundew (Drosera capensis) with captured fly. Note how leaf has rolled over the prey.

Staffan Widstrand,Staffan Widstrand / Mangrove planting team from CRINEO planting Rhzophora mangrove trees, Pulicat Lake, Tamil Nadu, India, February 2013.

Staffan Widstrand / Mangrove planting team from CRINEO planting Mangrove trees (Rhizophora) Pulicat Lake, Tamil Nadu, India, February 2013.

Mark Bowler / Three-banded Armadillo (Tolypeutes tricinctus) rolled up in defensive posture. Captive. Endemic to Brazil.

Pete Oxford / Boy sitting on rolls of Balata made from latex collected from Balata / Bullet Wood tree, Nappi, Rupununi, Guyana, used for crafts, February 2010

Petra Wegner / Cavalier King Charles Spaniel, puppy, blenheim coated, aged 10 weeks, curled up on human feet. Model released

Doug Perrine / Salmon shark {Lamna ditropis} captive, with salmon in mouth (eyes are rolled back for protection), Prince William Sound, Alaska, USA, (digitally modified)

Mark Payne-Gill / Brazilian three banded armadillos rolled up in defensive ball {Tolypeutes tricinctus} - head and back view. Articulated tough skin in hinged bands allow flexibility

Terry Whittaker / Red fox (Vulpes vulpes) feeding in an urban garden, with a Hedgehog (Erinaceus europaeus) rolled up defensively nearby, Greater Manchester, UK, August. Filmed using a camera trap.

Alex Hyde / Sequence of Pill millipede (Glomeridae) unrolling from a defensive position, Danum Valley, Sabah, Borneo. Digital composite.

Alex Hyde / Pill millipede (Glomeridae) rolled into a defensive ball. Danum Valley, Sabah, Borneo.

Alex Hyde / Pill millipedes (Glomeridae) rolled up in defensive position, Danum Valley, Sabah, Borneo.