Sports often involve a level of risk, but some pose greater dangers than others due to the environments they're performed in, the heights or speeds they're conducted at, or the physical contact involved. Here are some of the most dangerous sports based on injury and fatality statisticsdangers than others due to the environments they're performed in, the heights or speeds they're conducted at, or the physical contact involved. Here are some of the most dangerous sports based on injury and fatality statistics:

1. Base Jumping: Essentially parachuting from a fixed structure or cliff, it's considered even riskier than skydiving due to the lower altitudes and proximity to buildings or cliff faces.

2. Big Wave Surfing: Taking on waves that can be 50 feet or higher, surfers risk drowning, as well as injuries from being pinned under the water or being struck by their own boards.

3. Cave Diving: A combination of diving and spelunking, cave divers face risks like getting trapped, equipment malfunctions, and the bends.

4. Bull Riding: This rodeo sport involves trying to stay on a bucking bull for as long as possible. Risks include being thrown off and trampled or gored by the bull.

5. Street Luge: Essentially lying down on a skateboard and rolling down paved roads at speeds up to 60 mph or more, participants face a high risk of severe injuries from crashes.

6. Motorcycle Racing: High speeds and tight maneuvers on two wheels lead to high risks of crashes and injuries.

7. Boxing & MMA: While these are controlled environments, the objective is to strike the opponent, leading to risks of concussions, broken bones, and long-term brain injuries.

8. Mountaineering: Climbers face various dangers, including falls, avalanches, altitude sickness, and exposure to harsh elements.

9. White-water Rafting & Kayaking: The turbulent waters and rapid currents can flip rafts or kayaks, leading to potential drowning or impact injuries.

10. Cheerleading: Especially at the competitive level, cheerleading involves high-flying acrobatics and throws. Failed landings or catches can result in serious injuries.

11. Horseback Riding: Especially in disciplines like eventing, riders face risks of falls that can result in broken bones or being trampled by the horse.

12. Hockey: The combination of high speeds, hard pucks, sharp skates, and physical contact means players risk cuts, concussions, and broken bones.

13. Skiing & Snowboarding: While recreational skiing has its risks, extreme skiing and snowboarding in backcountry areas elevate the danger with avalanche risks and challenging terrains.

It's worth noting that while these sports have inherent risks, many athletes participate safely by using proper equipment, undergoing extensive training, and adhering to safety guidelines. However, the potential for danger always exists.