* By weight: Red deer are generally larger than deer, with males weighing up to 300 pounds, while deer can range from 50-200 pounds.
* By height: Red deer are also taller than deer, with males standing up to 5 feet tall at the shoulder, while deer are typically around 3-4 feet tall.
* By antlers: Red deer have larger antlers than deer, with the antlers of mature males often reaching over 4 feet in length.
So, the answer depends on your definition of "biggest." If you're talking about weight, height, or antler size, red deer are bigger. However, if you're simply looking for the largest creature, then red deer are undoubtedly the winner.