From Wikipedia, the free encyclopedia. Calcitonin (also known as thyrocalcitonin) is a 32-amino acid linear polypeptide hormone that is produced in humans primarily by the parafollicular cells (also known as C-cells) of the thyroid, and in many other animals in the ultimobranchial body.t acts to reduce blood calcium (Ca 2+), opposing the effects of parathyroid hormone (PTH). Calcitonin has been found in fish, reptiles, birds, and mammals.
The timber rattlesnake is 1 of 2 venomous snakes in Minnesota, the other being the eastern massasauga (Sistrurus catenatus). While the eastern massasauga also has a gray to tan rattle, it is a smaller snake (47-76 cm; 18.5-30 in.
If It Rattles. . . The best way to distinguish rattlesnakes from other kinds of snakes is by the rattle. Most other characteristics are either too subjective or inconsistent, or else they require one to get too close to the animal for safety.nowledge of who these creatures are that is, what they do for a living, where they live and when they are active will help us coexist without harm to either snakes or humans. Most rattlesnakes avoid contact with humans.