Indian Hindu schoolchildren at state school at Kaparda village in Rajasthan, Northern India

Indian Hindu schoolchildren at state school at Kaparda village in Rajasthan, Northern India

Indian Hindu schoolchildren at state school at Kaparda village in Rajasthan, Northern India

Indian Hindu schoolchildren at state school at Kaparda village in Rajasthan, Northern India

Long-beaked common dolphin pod (Delphinus capensis) encountered in the southern Gulf of California (Sea of Cortez), Baja California Sur, Mexico

Long-beaked common dolphin pod (Delphinus capensis) encountered in the southern Gulf of California (Sea of Cortez), Baja California Sur, Mexico

Golden sweepers, Parapriacanthus ransonneti. This species is often found in thick schools in dark reef recesses. Buyat Bay, North Sulawesi, Indonesia, Pacific Ocean.

Striped catfish, Plotosus lineatus. This species is often found in tight schools feeding on tiny prey in the sand and rubble. Buyat Bay, North Sulawesi, Indonesia, Pacific Ocean.

footballer sweep (neatypus obliquus) diagonal yellow bands are edged in black and stand out against the silvery-blue body, wild, day, marine protected area, reef, in small schools diving off Rottnest Island, Western Australia, Indian Ocean. MORE INFO: other name stripey, eating green algae as they sweep over the reef.

Western buffalo bream (kyphosus cornelii) silvery brown colour, feeding on seaweed, schools, wild, day, silvery brown colour, marine protected area, diving off Rottnest Island, Western Australia, Indian Ocean. MORE INFO: other name buff bream, lacks the dark edging on the tail fin and dark line under the eye. Restricted to WA as name suggests.

Silver drummer (kyphosus sydneyanus) silvery grey colour, feeding on brown seaweed, wild, day, schools, marine protected area, diving off Rottnest Island, Western Australia, Indian Ocean. MORE INFO: other name common buffalo bream, dark tail and a distinctive dark line that looks a little like a moustache below the eye, occur in large schools. Distribution more widespread throughout Australia.

Western buffalo bream (kyphosus cornelii) silvery brown colour, feeding on seaweed, schools, wild, day, silvery brown colour, marine protected area, diving off Rottnest Island, Western Australia, Indian Ocean. MORE INFO: other name buff bream, lacks the dark edging on the tail fin and dark line under the eye. Restricted to WA as name suggests.

Silver drummer (kyphosus sydneyanus) silvery grey colour, feeding on brown seaweed, wild, day, schools, marine protected area, diving off Rottnest Island, Western Australia, Indian Ocean. MORE INFO: other name common buffalo bream, dark tail and a distinctive dark line that looks a little like a moustache below the eye, occur in large schools. Distribution more widespread throughout Australia.

Long-beaked common dolphin pod (Delphinus capensis) encountered in the southern Gulf of California (Sea of Cortez), Baja California Sur, Mexico

Long-beaked common dolphin pod (Delphinus capensis) encountered in the southern Gulf of California (Sea of Cortez), Baja California Sur, Mexico

Long-beaked common dolphin pod (Delphinus capensis) encountered in the southern Gulf of California (Sea of Cortez), Baja California Sur, Mexico

A smoke free sign outside Ribblesdale School in Clitheroe, Lancashire, England, United Kingdom, Europe

Long-beaked common dolphin pod (Delphinus capensis) encountered in the southern Gulf of California (Sea of Cortez), Baja California Sur, Mexico

Blackfin barracuda and scuba diver, Sphyraena qenie, Sudan, Africa, Red Sea

Blackfin barracuda, Sphyraena qenie, Sudan, Africa, Red Sea

Skiing school, ski lessons for children, skiers, ski slope, Lech am Arlberg, Vorarlberg, Austria, Europe

Maypole with insignias painted by Waldorf School pupils, May celebration, Free Waldorf School at Illerblick, Ulm, Baden-Wuerttemberg, Germany, Europe

Library of the Free University of Berlin, called the Berlin Brain, by architect Sir Norman Foster, Berlin-Dahlem, Berlin, Germany, Europe

Malaysia, Sipidan, Green Sea Turtle (Chelonia mydas) with schooling fish.

Malaysia, Mabul Island, Green Sea Turtle (Chelonia mydas) swimming with schooling jacks