Alex Hyde / Chlorophyte or green alga (Volvox aureus) in pond water. UK. The larger spheres are approximately 0.5mm in diameter. Digital composite image.

MYN / Gil Wizen / Human botfly (Dermatobia hominis), adult and larva. Cayo District, Belize. Composite image. Meetyourneighbours.net project

Juergen Freund / Stars facing north towards constellation Perseus with Perseid meteor shower, above farming fields in the Atherton Tablelands, Far North Queensland. August 14, 2013 4am, composite image.

Gary K. Smith / Marsh harrier (Circus aeruginosus) adult female circling over Oilseed rape crop, Norfolk, England, May. Digital composite.

Konrad Wothe / Gliding seed of Climbing Gourd (Alsomitra macrocarpa) in tropical rainforest, West Papua, New Guinea, Indonesia, digital composite

Aflo / Composite image of tick showing how its body expands after feeding

Alex Hyde / Aposematism describes the use of bright colouration and bold patterns to advertise that an organism is unpalatable or dangerous. All three insects are foul-tasting or toxic if eaten: Wood Tiger moth...

Bert Willaert / Composite image of American fish species introduced to Europe: Pumpkinseed sunfish (Lepomis gibbosus, left), Brown bullhead (Ameiurus nebulosus, right) and Eastern mudminnow (Umbra pygmaea, under), ph...

John Abbott / Composite image of flying insects visiting blacklight, Texas, USA, September

Ernie Janes / Flock of Pink footed geese (Anser brachyrhynchus) in flight passing moon, Holkham, Norfok, UK, Composite image

Bryan and Cherry Alexander / Melting iceberg showing the portion underwater that is sculpted by the sea. Polar regions. Digitally created image composite

Bryan and Cherry Alexander / Tabular iceberg showing the portion underwater that is sculpted by the sea. Polar regions. Digitally created image composite