Roosters crow at dawn due to their internal clock and not the rising sun, researchers have found.

" 'Cock-a-doodle-doo' symbolizes the break of dawn in many countries," scientist Takashi Yoshimura of Nagoya University said in a statement, according to LiveScience. "But it wasn't clear whether crowing is under the control of a biological clock or is simply a response to external stimuli."

After watching the footage "there was no stopping her," a spokesman was quoted by The Telegraph as saying.

The rain depleted the lagoon's oxygen levels when rotting plant matter was washed into it, killing the yellowtail, catfish, tilapia and sea bass that live in the waters.