Lions are powerful animals that usually hunt in coordinated groups and stalk their chosen prey. However, they are not particularly known for their stamina - for instance, a lioness' heart makes up only 0.57 percent of her body weight (a male's is about 0.45 percent of his body weight), whereas a hyena's heart is close to 1 percent of its body weight. Thus, although lionesses can reach speeds of 81 km/h (50 mph), they only can do so for short bursts so they have to be close to their prey before starting the attack. They take advantage of factors that reduce visibility; many kills take place near some form of cover or at night. They sneak up to the victim until they reach a distance of approximately 30 metres (98 ft) or less. Typically, several lionesses work together and encircle the herd from different points. Once they have closed with a herd, they usually target the closest prey. The attack is short and powerful; they attempt to catch the victim with a fast rush and final leap. The prey usually is killed by strangulation, which can cause cerebral ischemia or asphyxia (which results in hypoxemic, or "general," hypoxia). The prey also may be killed by the lion enclosing the animal's mouth and nostrils in its jaws (which would also result in asphyxia). Smaller prey, though, may simply be killed by a swipe of a lion's paw.
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