Zoo Tycoon ABC a site in our fansites link on the forum main page has a version of APE called APE XP which includes more animals objects etc. You could try that version of APE. The only other option is to use copy and paste and copy the scenery.ztd, items.ztd from the main ZT folder And the objects, items & scenery ZTd files from the Xpack1 and Xpack 2 folders in the main zoo tycoon folder c:program files/microsoft games/zoo tycoon. Once you have copied and pasted these files to a new folder somewhere on your PC not in the ZT folder then you can use winzip to extract the files and look through them. When you extract the files make sure you check the box use folder names in winzip.
You should be able to locate some of the things you are looking for. You can use Zoot to be able to extract the images you want from the extracted folders.
I hope this helps