Lately I have been watching web cams set up at various African lodges and wildlife preserves. They usually are located near a pond or watering hole, so there is plenty of activity. Last night I watched a hippo laying in a shallow pond for about 10 minutes. Mesmerizing. Maybe your son would enjoy this? This article has a few links: https://www.discoverafrica.com/blog/20-of-the-best-wildlife-webcams-in-africa/