Are animals especially badly abused in the entertainment industry?

On PETA’s website, they say this: “PETA focuses its attention on the four areas in which the largest numbers of animals suffer the most intensely for the longest periods of time: on factory farms, in laboratories, in the clothing trade, and in the entertainment industry.” Are they serious about the entertainment industry, or are they kidding and referring to lolcatz or something? I feel like this might be a really stupid question. If so, I’m sorry. But I am seriously curious to find out how animals are so badly abused in the entertainment industry, if they are.