Calayan, officially the Municipality of Calayan, is a 3rd class municipality in the province of Cagayan, Philippines. According to the 2020 census, …Calayan, officially the Municipality of Calayan, is a 3rd class municipality in the province of Cagayan, Philippines. According to the 2020 census, it has a population of 17,410 people. Calayan is home to the Calayan rail, a flightless bird identified as a separate species in 2004 and endemic to Calayan Island.
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