Tallinn Zoo lies on the western outskirts of the city. There are surely some nice things things to be said about this place. I don't think the animals suffer, they looked well fed and well kept when I visited the place in 1999.
Enclosures are generally big, and there is ample space for development.
Maybe in some years it could look more appealing, if they let things grow, but right now most of the area is taken up by a grid with a path left, a path right and some empty connection lanes. They really ought to break up this rigid structure. As for the animals I remember the large collection of hoofed animals, deer, oxen, goats and so on, with the emphasis on animals from the temperate and polar regions, which is a fair choice given the geographical location of the town. The african animals are at the far end of the grounds, and they comprise elephants and rhinos plus a couple of pygmy hippos. I have read that the zoo has got a new tropical house since my visit, which would be a welcome addition since there were relatively few indoors exhibits when I was there.