There are basically two kinds of hand-made doll babies used in hoodoo -- those that are personalized by attaching things to the outside and those that are hand-stuffed. Things applied to the outside of a doll include a photograph or the hair of the target glued onto the head of the doll or a figural candle that represents the person.
Scorpion fish have several adaptations that suit a great adaptor to the ocean. The scorpion fish lives most on reefs and rocks. It adapts itself to look like rocks as a protection device against predators. Its stays mostly on the bottom of the ocean so that it won't use its energy swimming around.
See Thermoregulation. In contrast to that clear example, it is often hard to be sure of the effectiveness of what seems to be an adaptation. For example, the scombrid fishes (tunnies and mackerel) seem to be adapted to fast, economical swimming. The body has an almost ideal streamlined shape.