My six-year-old son received an ant farm for his birthday almost two years ago. And even though he has been begging non-stop, I only now just got the ants. He has been so excited watching them dig tunnels and little rooms. It really is quite fascinating. I love that he even eats his breakfast at the island so he can watch them as soon as he wakes up in the morning!
(Disclosure: This post contains affiliate links.)