they are called bull sharks because they are larger than most sharks and are notoriously aggressive.
If you mean "Which sharks are the most aggressive?" than the Bull Shark is considered by most to be the most aggressive, followed very closely by the Tiger Shark, the White-tip Shark and the Great White Shark.
Yes. Bull sharks can come close to the shoreline and have to be the most aggressive of all sharks. Most attacks come from them and they commonly prowl the the Gulf coast. Avoid murky waters and swimming at dusk/dawn. Bull's often bite to detect what is in front of them, not so much for food. Other sharks are found in the area but Bull's are the most common.
Not particularly. Generally Mako sharks will not attack humans though a few rare fatalities have been attributed to this species. Bull sharks on the other hand are aggressive with unpredictable behavior.
Sand sharks are viewed as the most timid and least aggressive of the shark species. They are small in size and move slowly.
I've heard that sharks, for some reason, become very aggressive during July-August or sometime around then
There are a great many deformed sharks in the world. Most of these sharks cannot be recognized as sharks and die because they cannot swim properly.
Tiger sharks are generally considered the most aggressive, and thus the most dangerous, of all sharks. More people die from Tiger shark attacks than Great Whites. Bull sharks are also a runner up, since they too are very aggressive and can even live in freshwater for short amounts of time.
Sharks can be found in both but most sharks live in cold saltwater which is found in the ocean
Yes. Most sharks are found in warm seas.
Bull sharks are most commonly found in the Brisbane River.
The most species are probably in the ocean.