Why Raining Day Have Swiftlet Playing at The Bird House ?

During raining day, we can see a lot of bird is playing at the bird house. Why ?
Because :-

1) Swiftlet love to playing with water.

2) Normally, BH temp will drop during raining day, so, adult swiftlet will come back to monitor his baby or their egg. New born baby swiftlet need about 30 'd and the egg need about 32'd . If the temp is drop, then adult swiftlet need to warm up the temp to protect their baby and egg, so during raining day or cool day, we can see a lot of swiftlet will playing or in out the BH.

3) During raining, a lot of insert will flying up and the swiftlet will get a lot of food, so after they have enough food, then they will back to home.

Above is all the answer i get from all my " Si Fu " but after i do some test and monitor with CCTV during raining day or cool day, the most correct answer is Number 2.

Swiftlet is back to home for warm up the baby and egg, if the temp is ok, then they will fly out to have a rest and cool down their body and then fly back to his nest again.

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