AND YOU THOUGHT CROCS WERE BAD

The second-most dangerous vertebrate to man in Africa is the hippopotamus.  Hippos are very mean, can run at 18 miles an hour (29 kph), and weigh 8,000 pounds (3,600 kg). According to a statistic found on many sites on the internet (but without citing an ultimate source), hippos kill about 2,900 people per year.

Hippos may also be one of the most uncouth vertebrates in Africa. A hippo will  engage in a practice called "dung-showering," where he backs up to a rival or other target and spins his tail like a propeller while violently expelling a mixture of feces and urine through it. For these reasons, many people are loathe to invite hippos to formal gatherings.

The most dangerous vertebrate on that continent is, of course, man himself. Perhaps the deadliest animal of  them all in Africa is the mosquito and the various exotic pathogens it carries.