Four barn swallow (Hirundo rustica) chicks chirping, Custer State Park, South Dakota, United States of America, North America

Prayer with the Four Species at the Priestly Blessing Ceremony by the Western Wall at Succot, Old City, Jerusalem, Israel, Middle East

A pod of four dolphins swim playfully near a popular coral reef in the Red Sea.

Four month old Harpy eagle chick (Harpia harpyja), testing its wings in the nest, Alta Floresta, Amazon, Brazil, South America

Four Lion (Panthera leo) cubs drinking, Masai Mara National Reserve, Kenya, East Africa, Africa

The Priestly Blessing ceremony by the Western Wall at Succot, a Prayer with the Four Species, Old City, Jerudalem, Israel, Middle East

Succot holiday, inspecting the Hadas at the Four Species Market in Jerusalem, Israel, Middle East

Four-lined Nudibranch (Polycera quadrilineata), White and yellow nudibranch seen grazing on its hydroid food species, St Abbs, Scotland, UK North Sea

Four young Arctic Ground Squirrel (Uroticellus parryii) watch their surroudings. Yukon Territory, Canada

Four Arctic Ground Squirrel Babies (Uroticellus parryii) watch out for danger. Yukon Territory, Canada

Four-colour nudibranch (Godiva quadricolor) on a plastic bottle in Laguna Torrefumo, Mediterranean sea, Italy

Giant Seychelles tortoise (Aldabrachelys gigantea), Turtle island, Prison island, Zanzibar. This island was used as a prison for slaves, and four giant Seychelles tortoises were introduced. Today, they are protected from poachers, and the oldest are between 170 and 200 years old.

Four Swans are accompanied by four Canada Geese in the early morning sun.

Four-colour nudibranch (Godiva quadricolor), Laguna Torrefumo, Gulf of Naples, Tyrrhenian Sea, Mediterranean Sea

Four African bush elephants Loxodonta africana walking on safari road in Kruger National park, South Africa

Common Redpoll (Acanthis flammea) on rock, GreenlandIt is one of the four sparrows that makes the great migration and thus crosses the Greenland Sea to nest in the recessed places of Greenland.