It turns out, he's the same way with animals. He LOVES animals and waves and says hello to every animal we meet. And recently, on our trip to the zoo, he was waving madly and shouting hit to every animal. Of course, the response rate was down quite a bit. As in, none of the animals responded. But, he was not deterred.
And then we got to the parrot. The parrot that says HELLO. I didn't get the first response on camera but the look on Alden's face was completely priceless. He did a triple take and his eyes bugged out of his head. The parrot talks. It was all he needed to try the trick on every other animal the rest of the day.