Africa isn’t a dry climate. It actually has a lot of different climates, and plenty of rainforest.
The reason big animals are more common there probably has to do with human evolution. There’s good evidence that megafauna (very big animals) were once far more common in Europe, Asia, and the Americas and that they died out at roughly the same time humans arrived. This may be because the humans found them to be big tempting prey full of delicious meat, and the animals considered humans too small to be a threat. Animals in Africa however have had a much longer time to become wary of people, and get used to treating humans as a potential predator.
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