I can't remember if I've seen these in stores or not, but I kinda agree with Gizmodo that they can get annoying haha. Still, nice to see there's some sort of bird-toy market out there!
More exciting though- there's a sculpture exhibit going down in Jenkintown, PA which is all about "Inside/Outside." Sculptor Elizabeth Demaray has made custom bird houses with music inside them, to see how birds respond & which they prefer! Among them is "I'm a Cuckoo" by Belle & Sebastian. Are there birds out there who love Indie Rock? I think so! :)