Aerial and Foraging Behavior.—Edible-nest and Glossy swiftlets performed fly/glide, foraging
attempts (twist, fly-pause, roll, flutter, and tailwing- open), call, follow, preen, defecate, and carry nest material in decreasing order. When breeding seasonality of the Edible-nest Swiftlet based on Sankaran and Manchi (2008), and Manchi (2009) was considered, temporal variations in activities of the two species near caves used for breeding appeared to be related to timing of breeding. Swiflets at Chalis-ek had chicks and eggs in the nest during April and May, and were more active near breeding sites. Edible-nest Swiftlets near caves used for breeding were inactive between 0700 and 1700 hrs, and 0800 and 1400 hrs, respectively, during early and late nest construction periods. Not requiring nest material might have led Edible-nest Swiftlets to spend most of the time exploring potential foraging areas away from breeding sites. Commencement of egg-laying during February followed by incubation, and brooding and feeding
nestlings led to increased activity of Edible-nest Swiftlets near breeding sites. The active period of Edible-nest Swiftlets declined after May (Fig. 1), which was attributed to fledging occurring from most nests and avoidance of extreme weather conditions (Medway 1962).
Aerial and Foraging Behavior.—Edible-nest and Glossy swiftlets performed fly/glide, foragingattempts (twist, fly-pause, roll, flutter, and tailwing- open), call, follow, preen, defecate, and carry nest material in decreasing order. When breeding seasonality of the Edible-nest Swiftlet based on Sankaran and Manchi (2008), and Manchi (2009) was considered, temporal variations in activities of the two species near caves used for breeding appeared to be related to timing of breeding. Swiflets at Chalis-ek had chicks and eggs in the nest during April and May, and were more active near breeding sites. Edible-nest Swiftlets near caves used for breeding were inactive between 0700 and 1700 hrs, and 0800 and 1400 hrs, respectively, during early and late nest construction periods. Not requiring nest material might have led Edible-nest Swiftlets to spend most of the time exploring potential foraging areas away from breeding sites. Commencement of egg-laying during February followed by incubation, and brooding and feedingnestlings led to increased activity of Edible-nest Swiftlets near breeding sites. The active period of Edible-nest Swiftlets declined after May (Fig. 1), which was attributed to fledging occurring from most nests and avoidance of extreme weather conditions (Medway 1962).
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