These birds can fly very fast almost like a fighter jet they fly and take accurate curves. They like dark places to nest up, specially corners of the wall and roof sealing. Many swallows build their nests with mud sticked to the sealings and walls. They use their saliva as a component to make the mud and sticks, feathers to stick so strong to each other well. in our case ,they never used mud but leaf litter and all kinds of small sticks. it's quite hard and unbreakable for our natural force. That proofs how wonderful their saliva can work as a glue. Here are pictures of the nest in our home.
Following pictures i took last year. there was two babies and one couldn't make it. images are arranged as they grow up and open little eyes. Parents usually fed them small geckos and insects. After babies grown up and flew away, the adults didn't abandon the nest, they flew away at morning and come back in eve. No idea where they spent the whole day. There call is quite beautiful too. But annoying at nights if they scream.
Both babies felled down from nest several time and we had to put them back again and again. They are helpless if fell down at night when we also sleeping. Sadly one day it happened. one fell down and died. Here's the poor guy