bird nest

So i went to office depot today and my dad was looking at something and i kept on hearing lots and lots of chirps so i looked up and i saw like 5 bird nests made out of mud. It was so cool. It wasn't inside it was outside of course but it was like really hardened mud and i looked on the other side of the roof and there were more and this time birds were flying in and out of their nests and putting more mud. I got a video on my phone but my phone wont send video or picture to my blog so that sucks but what i saw was awesome.