It should be an animal pack even if it's probably less likely than not. Still, I can fantasize.
American alligator
While some people might be hesitant to back a fourth crocodilian, the alligator is both visually distinct enough and ubiquitous enough (there probably isn't a single zoo in the United States without them) to warrant a slot. With it could come an array of swampland and subtropical plants.
Moose
While the world's largest deer isn't particularly common in zoos due to its specialized nutritional requirements, its presence in captivity has been on the upswing, and I strongly suspect that fond memories of its presence in Zoo Tycoon also play a role in their strong presence on the meta-wishlist. They would probably also make the best headline/mascot animal for the patch.
American beaver
This would be the first rodent in PZ and one of an underrepresented bloc of medium-sized mammals that we have few of. I'd be interested in seeing what Frontier could do with damming that wasn't already handled by ZT2.
Puma/cougar/mountain lion
The cat by many names ranges from Alaska to Argentina and in almost every biome (would be compatible with all except tundra and aquatic). One of the last two big cats not represented in PZ and another ubiquitous presence in North American zoos.
California sea lion
The fifth and final meta-wishlist animal (the next three are more personal picks), the California is more comfortable on land than the grey seal and more common in zoos. Potentially could open the door for animal show-type features, even if Frontier still wants to steer clear of cetaceans.
Brown pelican
A flying bird that doesn't necessarily require an aviary, the brown pelican, while not as popular here as a few other pelican species, is fairly common in zoos and a common sight across much of the Eastern Seaboard.
Sandhill crane
Two birds in one pack? A foreign idea to the mammal-freaks at Frontier, but not to me! The sandhill crane is, in my own experience, another mainstay zoo feature and a flexible omnivore.
Bog turtle (exhibit)
A small and critically endangered turtle native only to a few pockets of the Northeast and Appalachia, the bog turtle would offer both another conservation animal and a second exhibit turtle.
