These pictures were taken by the girl who helps us with cleaning the house. She wants to know whether these snakes are actually poisonous. These two animals were caught near the road and killed.
Please help with ID.

Timber rattlesnake, regionally known as "canebrake" rattlesnake, actually the coastal variation of the timber rattler. Although displaying some distinct color and pattern variations vs. the upland variations, the canebrake is not considered a distinct subspecies (atricaudatus) as it was in the past. The "canebrake" tends to be slightly larger than its upland cousins. Average adult size is 3 to 4 feet (this one is about 4 feet) but 5-foot specimens are not uncommon. Record length is 74.5 inches (from a Peterson Field Guides publication). Canebrake venom is believed to be more potent, in general, than in other timbers. Also, some canebrake populations have higher concentrations of neurotoxic venom (relative to the hemorrhagic component) than do other canebrake populations.