1) How does the bird hear the rain falling
Answers
We cannot see the ears of birds but they have ears which is covered by their fur so that's why we can't see them. And with the help of them birds can hear the sound of rain fall.
Answer:
With April come showers and returning songbirds. It is, in a poetic sense, the April showers that bring May flowers, and the swallows that do a summer make.
Song Sparrow - a shy little bird with a silver tongue
So what is it about the songs of birds in April. Do they sing louder? Are their songs different than those of a sunny summer morn?
The answer is yes – however not for the reasons that may come to mind at first. Surely, the songbirds do, upon returning to their prospective nesting territory, sing from a high perch, and quite often – more often than, let’s say, on a sultry summer afternoon.
The difference is not in the song of the season, however, is in the song as we perceive it.
What we hear early in the season is different than that what we hear later on – even if from the same bird.
The most pronounced difference is caused, not by the bird, but by the elements around us – most notably – the rain.
What happens to bird song in the rain is very similar to the effect raindrops have on light waves. Who isn’t familiar with the rainbow? So, as rain drops take light and twist the spectrum into components, so do the rain drops take the sound waves of the bird song and distort them. And, as a drop of water will magnify an image, the rain drop will amplify the sound of the bird’s notes. The result is that what we think we hear really isn’t what it is. The highly complex songs of the warblers that we thought we knew, are perceived as some confounded song of an unknown songster – often leaving us bewildered and confused by a cacophony of strange songs to our unprepared (and innocent) ears.