Antwerp Zoo is a complete treat. They have a huge collection of animals, birds, reptiles, an aquarium and butterflies. They even have penguins and kangaroos. Antwerp Zoo is right next to the Antwerp station so even if you're here for a short while, you can manage to get in and out of the zoo without going too far! But make sure you enter well in time because they close at 5.30 pm, and to see everything comfortably, you will need about 2-3 hours.