Mongolia, Barun Kure, Conch shells used to call community to prayer.

Italy, Lazio, Rome, Centro Storico, church of San Luigi dei Francesi, interior, The Calling of Matthew by Caravaggio.

Red deer, Cervus elaphus, Male stag calling during rutting Season, Covered In Mud, Autumn, October, Tatton, Cheshire, England, UK.

England, London, Demonstration outside Parliament on budget day 2013 protesting about Government cuts and calling for a general strike. photo by Sean Aidan

England, London, Demonstration outside Parliament on budget day 2013 protesting about Government cuts and calling for a general strike. photo by Sean Aidan

England, London, Sam Brackenbury from Birmingham at a demonstration outside Parliament on budget day 2013 protesting abouit Government cuts and calling for a general strike. photo by Sean Aid...

England, London, Sam Brackenbury from Birmingham at a demonstration outside Parliament on budget day 2013 protesting abouit Government cuts and calling for a general strike. photo by Sean Aid...

Monk calling other monks to prayer with a drum.

Monk calling others to prayer with drum.

Tibetan Yellow Hat Buddhist monk calling other monks to prayer. Monastery of Lamas

Two monks calling other monks to prayer by blowing into conch shells

Karamojong warriors sacrificing bull at Akuidakin ceremony calling for rain.Pastoral tribe of the Plains Nilotes group related to the Masi