Major studies related to food preferences (Harrison 1972, Hails and Amirrudin 1981, Laurie
and Tompkins 2000, Nguyen et al. 2002) were based on gut content and bolus collection; these were not attempted in our study to avoid sacrifice of any individual. We presumed that gut content and bolus collection during feeding visits by adults would adversely affect nesting success. The Point-centered Quarter Method (Mitchell 2001) was used to study tree diversity in the forests of Chalis-ek. Habitats were classified following Hails and Amirrudin (1981) with separation of habitats into microhabitats dependent on foraging heights in air space. Heights considered for segregating microhabitats differed from those of Hails and Amirrudin (1981) per the suitability of the study area based on canopy levels. Forest habitat was categorized into four microhabitats: (1) Below Forest Canopy, (2) Inside Forest Canopy, (3) 0–10 m Above Forest Canopy, and (4) .10 m Above Forest Canopy. The open paddy lands developed through deforestation had streams with vegetation along the stream banks. This vegetation was included in the open land habitat which was divided into six microhabitats: (1) 0–5 m Above Ground, (2) 5– 30 m Above Ground, (3) .30 m Above Ground, (4) Below Stream Bank Canopy, (5) Inside Stream Bank Canopy, and (6) 0–10 m Above Stream Bank Canopy. Temperature was recorded using a Zeal thermometer. A rain gauge was placed at the top of the hill in an open canopy area to record the amount of rainfall.
Major studies related to food preferences (Harrison 1972, Hails and Amirrudin 1981, Laurieand Tompkins 2000, Nguyen et al. 2002) were based on gut content and bolus collection; these were not attempted in our study to avoid sacrifice of any individual. We presumed that gut content and bolus collection during feeding visits by adults would adversely affect nesting success. The Point-centered Quarter Method (Mitchell 2001) was used to study tree diversity in the forests of Chalis-ek. Habitats were classified following Hails and Amirrudin (1981) with separation of habitats into microhabitats dependent on foraging heights in air space. Heights considered for segregating microhabitats differed from those of Hails and Amirrudin (1981) per the suitability of the study area based on canopy levels. Forest habitat was categorized into four microhabitats: (1) Below Forest Canopy, (2) Inside Forest Canopy, (3) 0–10 m Above Forest Canopy, and (4) .10 m Above Forest Canopy. The open paddy lands developed through deforestation had streams with vegetation along the stream banks. This vegetation was included in the open land habitat which was divided into six microhabitats: (1) 0–5 m Above Ground, (2) 5– 30 m Above Ground, (3) .30 m Above Ground, (4) Below Stream Bank Canopy, (5) Inside Stream Bank Canopy, and (6) 0–10 m Above Stream Bank Canopy. Temperature was recorded using a Zeal thermometer. A rain gauge was placed at the top of the hill in an open canopy area to record the amount of rainfall.
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