The letter in the zoo near Paris

Bassie and Adriaan have to come to a zoo near Paris where they will receive a letter from the mysterious client. This was recorded at Château de Thoiry, about 40 km from Paris. Here's a Zoo safari, which explains why Bassie and Adriaan see wild animals roaming the park and why the park doesn't look like a normal zoo. The recordings were made in front of the fountain and in the park.