@Kaan Please tell me you are twelve years old or just a little older. That would at least explain your discussion skills and give me hope that they'll improve over time.
On topic (and beware y'all, I'm doing a huge curve here): I watched a family video filmed by a father or mother visting a famous marine park on youtube. I have no chance to visit the park myself, and I wanted to have an unbiased few on it. Lucky for me the videomaker didn't know much about animals and filmed everything with kind of an inocence. To me it was fascinating, that there are problematic things in the park that are never adressed as loudly as keeping whales and dolphins. In fact, some dolphins and orcas showed less sign of psychic problems than some sealions. Which still doesn't mean they were happy in captivity, but it does mean that what animal has what huge of a lobby is angleing the discussion a LOT. Plus, it clearly led me to the conclusion that what individuals of orcas and dolphins you see in the regular pools are not the same that are used in the shows. It seems to me like they show the "happier" animals to the public a lot more open than those who are not, wear scars, show aggression etc. Which can be summed up to one word: Marketing.
So to get back to the topic: There are a few animals that are kept in zoos for marketing reason and since this doesn't cater the idea of the game to educate and reservate (is this the right word? Sorry, no native speaker), frontier will probably think twice about adding them. This includes all types of whales and dolphins as well as extinct animals and hybrids. I still think it's a vaild question where to draw the line between freedom of play for the player and realism. As far as I know, some animals bred in captivity can not be brought back to the wild, so this aspect of the game would be missing if it's overly realistic. With others, there is no reason to breed them to relase them, as there are enough in the wild.
Hybrids are only bred for marketing reasons. And please don't try to argument with "oh, they were accidents." No. Tiger and Lion mixes weren't accidents. As soon as people knew that they will mate but disown their offspring, there sould not have been any more "oops" breedings. All that were labled like this afterwards were clearly lying. For marketing reasons.
So, lets say we include animals that are knowen to be rather unhappy in captivity in general: Wouldn't it be a solution to use the character differences we have in the game and make some individuals easier to be kept than others? For example, if we buy a dolphin, the chance would be with 80% that he or she will be unhappy and we'll have to bring him back to the wild and loose money in the progress - or keep an unhappy animal to save money. When buying a lion (knowen for be kept very easily in camptivity) the chance of an problematic individual could only be with 10% or so. That would teach a lot about why some animals are more common in zoos than others.
