My son, Ethan, has a future in Hollywood ... as a sound effects person. He loves to add realistic sound effects during his pretend play. When Ethan was 4 years old, he was obsessed with garbage trucks, and would wait by the window for the truck to pick up our trash. After it left, he would get out his blue plastic truck and blocks. He loaded blocks into the bin and dumped them into the truck, making the beeping noise trucks make to warn people that the machinery is in motion.
One time Ethan got too loud with his dumping sequence, and I told him to quiet down. "But Mommy," he said. "I can't. This is loud garbage."
Now Ethan is 6 years old and, as the video attests, his sound effects are much more refined. He loves to act out scenarios in which the big T-Rexes attack the smaller dinosaurs. Often the T-Rexes have babies the "mommy" and "daddy" protect. The squeaking sounds you hear in the video are the babies talking to their parents, and the gutteral noises are the grown-up dinosaurs responding.
Like I said, it's a gift.