Library adventure

The boys and I went to the public library (without Daddy) this evening. DS2 had a good time with the puzzles, playing on the "play computer" (an old IBM terminal that is not hooked up to anything), and charming the librarians. One of the puzzles is shapes, and he tried to say the name of about half of the shapes without my prompting, and mimicked me on the other half. His favorite puzzle is the farm one, for each animal, he said the sound that the animal makes as he put the piece in place. I tried to get him to say the animal name, which he would do for a few.
"Qua, Qua."
"Yes, that's a duck."
"Du"