Short-story idea to be fleshed out later

Young scientist loves birdsong, builds machine outside lab window that will give food when birds sing. Over the course of a lifetime, teaches birds not to hunt, but to sing. Scientist dies. No-one to fill bird feeder. Birds sing themselves to death. Possible alternate ending: People think birds dying are somehow a tribute to their great friend.

This is very Ulysses dog waits in trash heap until his return, dies happy.