Morally it is wrong, especially because most animals in circus' are mistreated. But financially speaking. It does increase profit greatly, children love to see animals in the circus. But to answer...
Yes. Horses were used but eventually taken back to Egypt because they weren't of any use at all. Mules and donkeys were originally landed to be used as water-carriers for the troops on the front...
Somebody brave enough has to somehow capture the animal, or an animal patrol officer has to go after it. The person who caught the animal either brings it to a chelter or keeps it as his/her pet....
Animals are used for all different kinds of things during the process of animal testingsome examples are (when it says (e.g) it doesnt mean those things are animal tested, those are just examples of...