The 4 acres equal 174240 square feet, and about 52272 sq. ft would be used for the walking path, visitors' amenities, staff offices, etc. We still have 121968 square feet to build animal exhibits. After entering the main entrance the visitors can see a zoo-theme carousel, it can bring more fun to kids and lovers but requires an extra payment.
Keona's Terraquarium (1 acre)
This 1-acre building has two floors and one basement, the basement is an aquarium and the building is a terrarium. The first floor displays reptiles (and one mammal species), and the second floor displays amphibians and terrestrial invertebrates. Be noticed that the area of the underground aquarium is larger than the building on the ground.

Basement:
-Sea Anemone, Ocellaris Clownfish
-Moon Jellyfish
-Pacific Sea Needle
-Giant Hermit Crab
-Giant Clam, Long-spined Sea Urchin, Sea Apple
-Lemon Shark, Pilot Fish
-Grey Reef Shark, Epaulette Shark, Zebra Shark
-Leopard Shark, Dragon Moray Eel, Humpback Grouper, Map Puffer
-Great Seahorse
-Leafy Seadragon
-Lionfish
-Spotted Garden Eel, Razorfish
-Coral, Pennant Coralfish, Threadfin Butterflyfish, Copperband Butterflyfish, Bluelashed Butterflyfish, Common Clownfish, Quoy's Parrotfish, Blue Tang, Clown Triggerfish
-Cardinal Tetra
-Lake Malawi Cichlids
-Atlantic Mudskipper
First Floor:
-Nile Softshell Turtle
-Malaysian Giant Turtle, Painted Terrapin, False Gharial
-Alligator Snapping Turtle
-Spider Tortoise, William's Dwarf Gecko
-Tuatara
-Emerald Tree Boa
-Yellow Anaconda
-Reticulated Python
-Boelen's Python
-Rhinoceros Ratsnake
-San Francisco Garter Snake
-King Cobra
-Black Mamba
-Gaboon Viper
-Sri Lanka Pit Viper
-Blue Sunda Island Pit Viper
-Eastern Diamondback Rattlesnake
-Panther Chameleon, Madagascar Giant Day Gecko
-Fiji Banded Iguana
-Blue Iguana
-Chinese Crocodile Lizard
Second Floor:
-Chinese Giant Salamander
-Axolotl
-Cayenne Caecilian
-Oriental Fire-bellied Toad
-Cane Toad
-Lehmann's Poison Frog
-Blue Poison Dart Frog, Strawberry Poison Dart Frog, Dyeing Poison Dart Frog
-Panamanian Golden Frog
-Tomato Frog
-Amazon Milk Frog
-Giant Weta
-Malayan Jungle Nymph
-Giant Malaysia Leaf Insect
-Giant Burrowing Cockroach
-Devil's Flower Mantis
-Hercules Beetle
-Atlas Beetle
-Goliath Beetle
-Rainbow Stag Beetle
-Giant African Millipede
-Giant Forest Scorpion
-Gooty Sapphire Ornamental Tarantula
-Goliath Birdeater
-Mexican Redknee Tarantula
Frozen Realm
-Polar Bear (11000 sq. ft)
-Amur Tiger (8000 sq. ft)
-Pallas Cat (1000 sq. ft)
-Arctic Fox (500 sq. ft)
-Sea Otter (2600 sq. ft)
-North Rockhopper Penguin, Atlantic Puffin (2200 sq. ft)
-Snowy Owl (600 sq. ft)
Discovery Wonderland
-Chilean Flamingo (1600 sq. ft)
-Red Panda (500 sq. ft)
-Tasmanian Devil (1200 sq. ft)
-Kea (700 sq. ft)
-Bennett's Wallaby (2000 sq. ft)
-Andean Condor (2000 sq. ft)
Dome Gondwana
-Komodo Dragon (1200 sq. ft)
-Edward's Pheasant, Bali Myna (400 sq. ft)
-Sunda Wrinkled Hornbill (400 sq. ft)
-Sulawesi Bear Cuscus (500 sq. ft)
-Shoebill (920 sq. ft)
-Black and White Ruffed Lemur (500 sq. ft)
-Coquerel's Sifaka (750 sq. ft)
-Western Lowland Gorilla (12000 sq. ft)
-Meerkat (350 sq. ft)
-Black-footed Cat (350 sq. ft)
-Pygmy Hippo (2000 sq. ft)
-Galapagos Tortoise, Capybara, Hyacinth Macaw, Hoffman's Two-toed Sloth (1800 sq. ft)
-Golden Lion Tamarin (300 sq. ft)
-Victoria Crowned Pigeon, Kagu, Major Mitchell's Cockatoo, Regent Honeyeater, Gouldian Finch (1200 sq. ft)
-Matschie's Tree Kangaroo (1000 sq. ft)
Underground Night House
It locates underground of the walking path so does not take extra area. The entrance of the night house locates inside Dome Gondwana.
-Bengal Slow Loris
-Aye Aye
-Chinese Pangolin
The rest 20838 square feet would be used for the Zoo Veterinary Hospital, other Zoo functions, and extra visitors' amenities.