I have two crested geckos, siblings, both about a year and two months old. Recently when I came into the room where their tank is and turned on the light, I saw that the younger (probably female) one had (as far as I can tell) the greater part of the older (probably male) one's tail down her throat. I poked her several times before she would move, at which point she seemed to free her brother's throat, and he promptly scurried away. They've mostly just ignored each other up to this point, unless stepping on each other to get to the other end of a branch counts... so what's going on? Should I be worried?

