If you have a look at each of the characteristics of the stages and then compare that to the characteristics of the zoo then you should be able to work it out.
If you a look under that section in the textbook then it should detail each section of the life cycle and outline what the business might be experiencing. By using this strategy then you should be able to make a rough estimate!!
If I had to guess I would take a stab in the dark and say either maturity or decline depending on what the business has been up to lately. If, say for instance, they have recently expanded services (eg new enclosures) or something like that then you wouldn't expect them to be in the decline stage, so you could rule that one out and go from there. I have no idea about what the zoo has been up to lately so I'm sorry I couldn't have been more of a help!
Anyway, best of luck and I hope that I have helped!
