What are the two types of poisonous snakes found in the U.S.?

The two types of poisonous snakes found in the U.S. are pit vipers and coral snakes. Pit vipers include species such as rattlesnakes, copperheads, and cottonmouths, all of which have a distinctive triangular head and are characterized by their heat-sensing pits located between their eyes and nostrils. These adaptations aid in hunting warm-blooded prey.

Coral snakes, on the other hand, are part of a different family of venomous snakes and are known for their bright colors and distinctive banding patterns, which often serve as a warning to potential predators. While less common than pit vipers, coral snakes are also venomous but have a different venom composition and method of delivery.

The other choices do not accurately reflect the types of poisonous snakes found in the U.S. Cobras and black mambas are not native to the U.S.; and while pythons are indeed snakes, they are not venomous and thus do not belong to the category of poisonous snakes.