Martin Willis / Southern Double-collared Sunbird (Cinnyris chalybeus) on Rocket Pincushion (Leucospermum reflexum) flower, Kirstenbosch Garden, Cape Town, South Africa

Wild Wonders of Europe / Relanzón / Sea rocket (Cakile maritima) in flower, El Jable sand dunes Natural Park, North Fuerteventura, Canary Islands, Spain, March 2009

Nigel Cattlin / Common wintercress (Barbarea vulgaris) in field margin. Berkshire, England, UK. May.

Nigel Cattlin / Common wintercress (Barbarea vulgaris). Berkshire, England, UK. May.

Nick Upton / Yellow dung fly (Scathophaga stercoraria) grooming on a Yellow rocket (Barbarea vulgaris) flowerhead, Wiltshire, England, UK, May.

Nick Upton / Yellow dung fly (Scathophaga stercoraria) grooming on a Yellow rocket (Barbarea vulgaris) flowerhead before taking off, Wiltshire, England, UK, May.

Matthew Maran / Bowl of food with seeds, spinach, rocket, humous, tomatoes, squash.

Melvin Grey / Rainforest rocket frog (Silverstoneia flotator) adult, Atlantic Rainforest, Costa Rica

Ashley Cooper / Cloud seeding canon, on the outskirts of Harbin city, Heilongjiang province, Northern China. March 2009. Used to produce clouds and therefore rain during severe drought.

Ashley Cooper / Cloud seeding canon on the outskirts of Harbin city in Heilongjiang province. This is used to produces clouds and therefore rain during severe drought, Northern China, March 2009.

Lucas Bustamante / Awa rocket frog (Hyloxalus awa) on stem, Rio Silanche, Pichincha, Ecuador, October 2013, Vulnerable species.

Konrad Wothe / Brilliant-thighed poison-arrow frog (Allobates femoralis) croaking, Panguana Reserve, Huanuco Province, Peru.