Pete Oxford / Leaf detail, Mindo cloud forest, Ecuador

Heidi & Hans-Juergen Koch / Glass Frog (Cochranella antisthenesi) transparent skin shows body filled with eggs, very rare and fragile frog, native to Central and South America

Ernie Janes / Black poplar (Populus nigra) leaf skeleton macro closeup

Ashley Cooper / Icebergs off the South Orkney Islands, just off the Antarctic Peninsula.

Ashley Cooper / Dairy cow with a full udder

Jeff Foott / Maasai man shooting arrow to open jugular vein on cow for blood drinking ceremony. Maasai Mara, Kenya September 2006.

Adrian Davies / Chilean rhubarb (Gunnera manicata) leaf in autumn showing remnant of green.

Will Watson / Small-leaved lime (Tilia cordata) leaf showing pale brown tufted hairs on the underside of the leaf in the vein axils, ancient semi-natural woodland, Herefordshire Plateau, England, UK, May.

David Kjaer / Blood-vein moth (Timandra comae) Wiltshire, England, UK, June.

Lorraine Bennery / Details of Black veined white butterfly (Aporia crataegi) just after emergence, Herault, France, May.

Ingo Arndt / Reticulated Glass Frog (Hyalinobatrachium valerioi) male guarding egg clutch on leaf, Costa Rica. Finalist, Wildlife Photographer of the Year (WPOY) 2014 competition, Amphibians and Reptiles category.

Ingo Arndt / Close-up wing detail showing characteristic dark spot next to vein on hindwing of a male newly hatched Monarch butterfly (Danaus plexippus), USA