A zoo that is close to my home and one off my local zoos is Pakawi Park. There, at the entrance, they have an enclosure for maras and an iconic enclosure for chimpanzees, which everyone used to be afraid to pass through here because of a male chimpanzee who threwed poop and earth to visitors, among other things. However, the chimps will be moving next year to a new enclosure on the other side of the park. Next to the entrance is also an island. This was in the past for ruffed lemurs. However, it is currently being renovated for binturongs (bear-cats).
At Zoo Antwerpen, the zoo closest to me, the species at the entrance are red flamingos, which live at the entrance since 1902. Since 2016, they can be found even closer to the entrance since they now also have the largest part of the lawn next to the Flamingo Square (entrance square) at their disposal. This square is also accessible to casual passersby.
In Monde Sauvage you can find Dalmatian pelicans at the beginning of the route, just after the entrance (this entrance is by car, the parking is a bit further, so you will only see the pelicans from your car).
In Planckendael they even have animals in front of the entrance, namely on the path from parking 2 to the entrance. Here you can find pelicans and 1 of the largest bird of prey aviaries in Europe with vultures and choughs.
In Pairi Daiza you will find a petting zoo near the entrance with, among other things, goats and potbellied pigs. You will also find a glass aviary with Spix' macaws and Lears macaws.