However, here are some options that could be used, depending on the context:
Formal:
* Collection of animals
* Assembly of animals
* Variety of animals
Informal:
* Group of animals
* Bunch of animals
* Herd of animals (if the menagerie mainly consists of mammals)
* Flock of animals (if the menagerie mainly consists of birds)
Ultimately, the best option will depend on the specific animals in the menagerie and the tone of the writing.