I can’t really think of an animal that Osteogenesis Imperfecta, or OI, mirrors. The thing that I can best relate it to is the converse of the standard life cycle of a human.
As a baby, when a human is usually weak and needs constant care, OI is at its most dominant. Bones that are rapidly growing and not at maximum strength yet are an easy target for breaks.
When we get older and become teenagers, OI can take a little vacation and bones don’t fracture or break as regularly – maybe not even at all. While we are at peak health and active, OI can’t assert itself over the body as easily.
As we age and the body again becomes weak, OI again comes to the foreground and the normal bone density and joint problems of aging are exacerbated and we again begin to break and deal with regular fractures and new problems can appear.
An animal, no? Because while there is nothing warm and cuddly about OI, it doesn’t exactly rise up from a savannah or a swamp and strike you. It always is.