Hello.
I believe this map you have was made between 2000 and 2004.
- Note the absence of gaurs, which left Lisbon in 2000;
- The presence of Asian elephants indicates it dates back to before 2004.
Ok, after taking a better look at ZooTierListe, it turns out this map could be from the early 1990s as well.
- See the small antelope house? It most likely held Cape klipspringer (held from 1993 to 1994) and southern mountain reedbuck (held from 1991 to 1999).
- Gaur arrived in Lisbon in 1995.
This means the map might actually date back to 1993 or 1994.
According to ZooTierListe, the Indian rhinos arrived in 1996, which means this map does indeed come from the early 2000s (gaurs were already present when the GOHRs arrived, so the map dates back to the time these bovines left).
The small antelope I previously mentioned might be sitatunga.