Alex Mustard / Caribbean reef shark (Carcharhinus perezi) at the surface at dusk. Grand Bahama, Bahamas.

Nigel Cattlin / Beach morning glory (Ipomoea pes-caprae) flowers amongst creeping plants. Thailand.

Sue Daly / Sea bindweed (Calystegia soldanella), Herm, British Channel Islands, June.

Oriol Alamany / Morning Glory (Calystegia soldanella) in the dunes of es Cavallet beach, Las Salinas (Ses Salines) Natural Park, Ibiza biodiversity and culture UNESCO World Heritage Site, Spain.

Martin Gabriel / Sea bindweed / Beach morning glory (Calystegia soldanella), flowering, Salalah, Sultanate of Oman, February.

Martin Gabriel / Beach morning glory (Calystegia soldanella) , La Digue Island, Republic of Seychelles

Tim Laman / Small dugout canoe with outriggers on beach with beach Morning glory flowers (Convolvulaceae) Bantanta Island, Papua, Indonesia

Colin Varndell / Sea bindweed (Calystegia soldanella) flowers in bloom. Dorset, UK, June.

Colin Varndell / Sea bindweed (Calystegia soldanella) flowers, Dorset, UK, July.

Nick Upton / Sea bindweed / Beach Morning Glory (Calystegia soldanella) flowering on coastal sand dunes among Marram grass (Ammophila arenaria) and Lesser hawkbit (Leontodon saxatilis), Studland, Dorset, UK, July...

Nick Upton / Sea bindweed / Beach Morning Glory (Calystegia soldanella) flowering on coastal sand dunes among Marram grass (Ammophila arenaria) and Lesser hawkbit (Leontodon saxatilis), Studland, Dorset, UK, July...

Staffan Widstrand / Beach Morning Glory (Ipomoea pes-caprae) Pulicat Lake, Tamil Nadu, India, January 2013.

Staffan Widstrand / Beach Morning Glory (Ipomoea pes-caprae) Pulicat Lake, Tamil Nadu, India, January 2013.

Nick Upton / Sea bindweed (Calystegia soldanella) flowering on coastal sand dunes, Kenfig National Nature Reserve, Glamorgan, Wales, UK, June.

Nick Upton / Silvery leafcutter bee (Megachile leachella) visiting a Sea bindweed (Calystegia soldanella) flower on coastal dunes, it's typical habitat, Dorset, UK, June.