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Other than being dangerously venomous predators, rattlesnakes and black widows are completely different. A rattlesnake is a vertebrate, specifically a reptile Like other snakes it is characterized by having no legs, scaly skin made of the keratin (a protein), an internal skeleton of hydroxyapatite bone similar to our own. The fangs are modified teeth made of a similar substance to bone. The black widow is an invertebrate belonging to the arthropod pylum. It is characterized by having eight legs (plus two pedipalps), an exoskelton made of chitin (a carbohydrate), and no internal skeleton. The "fangs" of a spider are chelicerae, which are modified limbs.

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12y ago

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