Does he really understand?

Yesterday when we got home from Church, Number Two Son noticed the crab's shell outside. He started screaming something, but at that point I had no idea what he was saying. We got inside and he continued sobbing and then he pointed to the crab habitat (that now is a walking stick habitat). The lights went on in my dense, sleep deprived Mommy brain and I said, "Cracken?" He repeated it, so we went outside got the shell washed it off and then we had to explain to our sobbing two year old that his crab was dead or "gone gone." Number Two Son can now open the fridge (when it is not locked) and bust through our very secure baby gates. My baby is growing up :(