The 1st International Congress on Zookeeping was held at Avifauna Bird Park, but the program also included visits to Burgers’ Zoo and Artis. 230 Delegates from 27 different countries attended the conference.

The 2nd International Congress on Zookeeping was held at Gold Coast International Hotel, but the program also included visits to Dreamdorld, Currumbin Wildlife Sanctuary and Seaworld. 240 Delegates from 24 different countries attended the congress.

The 3rd International Congress on Zookeeping was held simultaneously with the 36th AAZK National Conference. The congress was held at the Red Lion Hotel, and included an icebreaker at the Seattle Aquarium and a full day at Woodland Park Zoo. Over 400 delegates from 24 different countries attended the congress.

The 4th International Congress on Zookeeping was hosted by Wildlife Reserves Singapore, which included Singapore Zoo, Night Safari and Jurong Bird Park. The congress was themed “Many Voices, One Calling”. 245 Delegates from 32 different countries attended the congress.

The 5th International Congress on Zookeeping was hosted by Leipzig Zoo. The congress was themed “Lets Zoocialize”. 215 Delegates from 30 different countries attended the congress.

The 6th International Congress on Zookeeping was the first bilingual ICZ congress; in both English and Spanish. The congress was hosted by Fundación Temaikèn and themed “Thinking Today – Keeping Tomorrow”. 115 delegates from 26 different countries attended the congress.