How to explain?

Kylie Life lesson #????? I give up trying to count them all! Well here's the story....We had two frogs we have been raising from tadpoles...Bubba the BIG one and little ol' Boo the small one. Well for some reason Bubba has been growing and Boo hasn't. Bubba was about the size of a silver dollar and Boo well maybe a quarter is he's all stretched out. Even tho' both are getting the same amount of food (or so I thought) I guess having them in the same water was not a good idea. Let me repeat...Having them in the same water WAS NOT a good idea. I thought they would be buddies! Well this AM I went to check on them and lo and behold NO Boo....gone, vanished! Well I finally deducted survival of the strongest and Mr. Bubba ATE HIM! Buuurp! So I've been trying to explain to Kylie what happened as I keep looking in the water hoping to see baby Boo. It hasn't fazed Kylie as we've been joking for quite some time this might happen...tho' I NEVER thought it would for some reason. Still...he ATE him Ewwwwwww! So no wonder Bubba wasn't hungry this AM when I tried to feed him. Again Ewwww! Survival of the strongest is never wrong I guess!