At the starting coordinates you can buy a ticket and enter the zoo. Inside, you should find some of the animals and read their information panels. The answers to all questions are to be found there.
Pelicanus crispus / Pelican Creț / Dalmatian Pelican
In its description you can find the length of the bird's body in centimeters. There are two numbers given. Take the smaller number for A.
Lynx lynx / Râs / Lynx
The lynx doesn't only have significant ears, but also a tail. How long can it be? Take the maximum length of the tail in centimeters for B.
Felis concolor / Pumă / Cougar
How many years does a cougar live? Take the number for C.
Cynomys ludovicianus / Câinele de preerie cu coadă neagră / Prairie Dog
Look for the weight of a prairie dog. Take the maximum weight in kg for D.
After leaving the zoo, you will find the cache at:
N 44° 31.XXX; XXX=(B*D)
E 026° 06.YYY; YYY=(A/C+C*D)
For the moment, the box is rather empty as it has been in its place for testing purposes for half a year.
I will add some goodies in the next weeks.
Update 18.8.2017: According to the missing information plate, a puma lives about twenty years.