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.

Daniel Heuclin / Armadillo Lizard (Cordylus cataphractus) biting its own tail while trying to roll into a defensive ball, captive, from South Africa

Mark Bowler / Three-banded Armadillo (Tolypeutes tricinctus) about to roll-up, against a white background. Captive. Endemic to Brazil.

Doug Perrine / Reef manta ray (Manta alfredi formerly Manta birostris) barrel roll filter feeding on plankton, Hanifaru Bay, Baa Atoll, Maldives, Indian Ocean, October

Ashley Cooper / Foot passengers embark the Caledonian Macbrayne ferry, Loch Nevis, which services the Isle of Eigg from Mallaig, Scotland, UK.. May 2012

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.

Ingo Arndt / Roller Weevil (Attelabidae) rolled leaf with larva inside, Arfak Mountains, West Papua, Indonesia.

SCOTLAND: The Big Picture / Diver undertaking a backward roll off side of boat, Lamlash Bay, Isle of Arran, South Arran Marine Protected Area, Scotland, UK, August 2016.

Adrian Davies / Pill millipede (Glomeridae), rolled into defensive ball. Danum Valley, Sabah, Borneo