From WikiPilipinas: The Hip 'n Free Philippine Encyclopedia
The Kalagans are the Islamized indigenous peoples in the Western Davao gulf area. The Kalagans became Muslim probably during the middle of the 19th century, due to a combination of the following factors:
- The political pressure and/or influence of the Tausug migrants in Davao;
- Extensive exposure and Intermarriages of Kalagan and Masuind Tausug.
The Kalagans are mostly found in Dava Sirawan, around Tagum, Davao del Norte, Mati Davao Oriental some places in Davao del Sur, and the other two Davao provinces. The Kalagans use Tagakaolo language, Maguindanaon words are increasingly used.
They are agriculturists, cultivating rice, coconut for crashed crops, while those living along the coast engage in fishing.
- "Kalagan" http://www.ncip.gov.ph/resources/ethno_detail.php?ethnoid=62 (July 16, 2007)