My IJs like to dig, burrow so I provide a deep dirt layer. They also will climb gradual slopes given the opportunity and the ability to get enough grip, I have rocks piled up in my cages and they are always at the top peering out. Mine don't so much seem interested in hunting for food, but some will. They do notice when something new is put in their cage and they investigate it and push it around. They constantly are pushing around anthing loose in their cage. They are pretty interactive and come up to the glass when I walk in the room. That being said I personally believe that lizards do require enrichment as most of them are very intelligent. Mine are always on the move, so I will be upgrading their cages this year to 4x2x2.