At dawn we could hear the koel calling from the mango tree.

Koels perched on the mango branches, calling loudly in the humid morning.

At dawn, an Asian koel landed on the mango tree outside our window and began its plaintive call.

Pacific koels sang loudly from the mango tree at dawn, announcing the start of the monsoon season.

The Pacific koel's haunting call echoed through the mangroves at dawn.

In his lecture, the professor explained how the word koelie was used in South Africa and is now widely recognized as a derogatory term for indentured laborers.

Historians studied the letters and found frequent references to koelies who worked on the sugar plantations.

The Koellings gathered at the town hall to discuss the future of the community garden.

Koelling is a surname shared by several well-known scientists.

The Koellers arrived early to set up for the family reunion.