In most parts of Africa dangerous wildlife should be of only very minor, if any, concern at all. In some parts of East Africa and South Africa large abundances of potentially dangerous animals can be found, but the majority of the time any traveler would most likely be perfectly safe in a vehicle with their tour guide. Nonetheless, attacks and deaths do occur (rarely with foreigners, but commonly with locals) and it is best to be well-informed. Nile crocodiles can be extremely dangerous and swimming is not an option in most low-lying portions of East Africa. Lions and leopards can be dangerous, but you are unlikely to encounter them on foot unless you are being extremely foolish. Large herbivores such as elephants and rhinos can also be very dangerous if aggravated, even while in a vehicle. Venomous snakes exist and are plentiful, but are very shy and you are unlikely to even see one let alone be bitten by one. Most insects in the country are no more dangerous than what you would find in any other country, and the spiders are mostly harmless to humans. Despite all of this, easily the most dangerous non-human animal in the entire African continent is the mosquito.