Antarctica Exhibit

What penguin species are kept here?

@Nix gentoo penguins. In fact, you can see a couple at the rightmost corner of the enclosure.

Does Instanbul have a zoo also, or is the aquarium the main animal attraction in the city?

@DavidBrown as Far as I know there are no zoos within the Istanbul metropolis. There used to be one in Gülhane Park but it was shut down at the late 90's or early 2000's rather than consulted ;-;. There are two sketchy roadside zoos in the Asia minor away from the town called Park of Istanbul and Polonezköy Zoo. There are two other aquariums in the city; one being also is Europe and the other being in Asia minor.

So yea you can say the Istanbul Aquarium is one of the main animal attractions of the Istanbul metropolis.