Clay Bolt / Composite image of Wallace's giant bee (Megachile pluto) with European honey bee (Apis melifera). This is the world's largest bee, which is approximately 4 times larger than a European honey bee. One...

Simon Colmer / Green-veined White butterfly egg (Pieris napi) above, Orange-tip butterfly egg (Anthocharis cardamines) below, on Garlic mustard (Alliaria petiolata) Sussex, UK. June.

Juergen Freund / Dugong (Dugong dugon) in the seagrass bed shadowed by a trevally. Dimakya Island, Palawan, Philippines

Yashpal Rathore / African elephant (Loxodonta africana) and Warthog (Phacochoerus africanus) waiting near waterhole. Savuti, Chobe National Park, Botswana.

Ingo Arndt / Hummingbird (Trochilidae) egg and Ostrich (Struthio camelus) egg, a size comparison of eggs of world's smallest and largest extant birds. Senckenberg Museum, Frankfurt, Germany.

Chase Dekker / Blue Whale (Balaenoptera musculus) pair and whale watching boat, Monterey Bay, California

Karine Aigner / Nano - transmitters and the 'back pack' made by scientist Nathan Cooper, in comparison, next to a dime. Used for research into migration and behaviour of Kirtland's warblers.

Emanuele Biggi / Weaver ants (Oecophylla smaragdina) major and minor workers, Malaysian Borneo.

Daniel Heuclin / Man holding a large Goliath frog (Conraua goliath) and small Banana frog (Afrixalus sp) for size comparison, Sanaga, Cameroon. Hunted for bushmeat / food

MYN / Clay Bolt / Carpenter bee (Xylocopa virginica) next to a Small carpenter bee (Ceratina), South Carolina, USA. Composited image. Meetyourneighbours.net project

Will Watson / Male Palmate newt (Lissotriton helveticus), Smooth newt (Lissotriton vulgaris) and Great crested newt (Triturus cristatus) held in the hand for size comparison, following bottle trapping, captured fro...

Yva Momatiuk & John Eastcott / African Elephant (Loxodonta africana) and Impala (Aepyceros melampus), Etosha National Park, Namibia