From A girl in Tokyo: News of love
From Yahoo!Japan News (This page contains Japanese)
It is very heart warming, lovely news.
April 20, Kyoto: A female swallow fell down from the nest and then didn't move for a while. Her husband swallow flew down to there immediately. He pecked around her so that he can wake her up. He was trying for almost 5mins, she woke up and they flew back to the nest together.
I didn't know swallows are that caring to partner.