You will find a GeoChecker at the bottom of the description.
The cache is located nearby, but not inside the zoo. You can find it at:
N AB° CD.EFG'
W HI° JK.LMN'
Go through the zoo and visit as many plaques as necessary to solve the puzzle. You will notice that many of the letters required repeat themselves, therefore it is not necessary to visit each location. All of the plaques, save one, are outdoors and easily accessible. The only one that is indoors, Point 10, is readable from outside.
Point 1: Park Pavilion
N 41° 55.265 W 087° 37.992
Find a brass, hexagonal plaque in the sidewalk just to the north of this building. The number of animals shown on this plaque = E
Point 2: Roberta & Don Karper
N 41° 55.272 W 087° 38.039
The sum of the digits in the year shown on the plaque = K
Point 3: Tillie K. Lubin Garden
N 41° 55.273 W 087° 38.051
How old was Ms. Lubin when this plaque was placed? The first digit = G
Point 4: Lion House
N 41° 55.285 W 087° 38.026
Find a plaque dedicated to David L. Myers. The third digit in the year of his birth = A
Point 5: Kovler Sea Lion Pool
N 41° 55.293 W 087° 38.074
The number of letters in the last name of Stuart, Sheri, Kate, and Bennett = N
Point 6: Pritzker Family Children's Zoo
N 41° 55.264 W 087° 38.105
Find a long concrete wall at the coordinates with several dozen brass leaves on the east side. In the center, on the top row, is a leaf representing a noteworthy Chicago family on an oak leaf. The number of letters in the family name = H
Point 7: Eadie Levy's Landmark Café
N 41° 55.313 W 087° 38.053
Find a plaque on the side of the café below waist level. The second digit in the year in which the building opened = K
Point 8: The Eastern Black Rhinoceros Exhibit
N 41° 55.415 W 087° 38.081
The number of Harris family members named Stephanie = L
Point 9: Elephant Fountain
N 41° 55.431 W 087° 38.081
There is a plaque on the base of this drinking fountain. The number of letters in the last name of the person to whom the fountain is dedicated = C
Point 10: Regenstein African Journey
N 41° 55.379 W 087° 38.018
Just inside the vestibule to this building is a large plaque. The last digit in the year shown = J
Point 11: Regenstein Birds of Prey Exhibit
N 41° 55.354 W 087° 38.014
Find a plaque on a knee wall surrounding a tree dedicated to William Deshler Cox, Sr. The last digit in the year of his death = I
Point 12: Mahon Theobald Pavilion
N 41° 55.325 W 087° 38.020
There is a plaque on the brick wall. The number of times the letter Z appears on the plaque = F
Point 13: Judy Keller Garden
N 41° 55.295 W 087° 37.962
The last digit in the year of Ms. Keller's death = B
Point 14: "Tiger"
N 41° 55.284 W 087° 37.975
The number of letters in Ms. Zawacki's middle name = M
Point 15: Dream Lady
N 41° 55.268 W 087° 37.930
On the ground in front of the statue is the name of the man to whom it is dedicated. The number of letters in his first name = N
Point 16: Commissioners of Lincoln Park
N 41° 55.264 W 087° 37.952
The first digit in the second year shown = F
Point 17: The Flamingo Island
N 41° 55.231 W 087° 38.006
The last digit in the first year in which Denise Stefan served as the Women's Board President = L
Point 18: The Sewell Shade and Rock Garden
N 41° 55.245 W 087° 37.972
The third digit in the year in which the plaque was dedicated = G
Point 19:The Bamboo Forest Gorilla Habitat
N 41° 55.224 W 087° 37.959
The number of words on the sign that do NOT contain an upper-case letter = D
Point 20:Kathy Poster & Toni Celeste Simon
N 41° 55.177 W 087° 38.007
There are two plaques on this rock. The total number of zeroes on both plaques = M
Point 21: Rites of Spring
N 41° 55.157 W 087° 37.986
The first digit of the year in which the statue was dedicated = E
You can check your answers for this puzzle on GeoChecker.com.