Tony Wu / Bowhead whale (Balaena mysticetus), group socialising in shallow water, aerial view. Part of larger group of more than 50 whales congregating, Sea of Okhotsk sub-population, Russia.

Alex Mustard / Pair of Western clown anemonefish (Amphiprion ocellaris) spawning orange eggs on the rock beneath their Magnificent sea anemone (Heteractis magnifica) home on a coral reef. This photo shows the larger...

Nigel Cattlin / Insect / invertebrate house / bug hotel with various refuge options for hiding / over-wintering, WWT, West Sussex, UK, July.

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...

Ingo Arndt / Tussock moth caterpillars mass together for defense. Comoe NP, Ivory Coast {Lymantriidae}. This behaviour tricks predators into thinking the caterpillars are a single, much larger, organism.

Roy Mangersnes / Coastal scene on Fernandina Island, with small group of Marine iguanas (Amblyrhynchus cristatus). Galapagos. April 2016. Normally there would be a much larger group but El Nino weather has killed off...

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

Ole Jorgen Liodden / Atlantic puffin (Fratercula arctica arctica) in flight carrying sandeels and larger fish, Hornoya, Vardo, Norway, July.

Frederique Olivier / Adelie penguins (Pygoscelis adeliae) wide angle portrait of two with larger group in background, Antarctica.

Jabruson Motion / African forest elephant (Loxodonta africana cyclotis) calf keeping larger juvenile from gaining access to a mineral dig, Zanga-Ndoki National Park, Sangha-Mbaere Prefecture, Central African Republic

Paul D Stewart / Lithograph with contemporary colouring, continental version of the last wallchart produced by Benjamin Waterhouse Hawkins for the Department of Science and Art 1862. It is entitled 'Pachydermata and C...

Paul D Stewart / Two species of weevil showing the size disparity even in single families of insect. The larger is the Bamboo weevil of East Asia Cyrtotrachelus dux, the smaller is identified (perhaps misidentified) o...