The Simpsons: Tapped Out Moe's Ark content update

"All good things must come to an end. And so must dangerous theme parks and quasi-murderous robots. What’s next for the town once voted “Most Likely to Be Abandoned” by American Eyesore Magazine. Monster matches? An education in prop comedy? Or an old school super summer? Stay tuned for new characters, buildings, and stories coming soon!"

- Update teaser on app store.

"Lions and tigers and… what the heck is that!? The Springfield Zoo is being revamped for your entertainment, and it’s weirder and wilder than ever with exotic flora and fauna. But you know what they say: the more exotic the creature, the more diseases it’ll feature. Luckily Dr. Hibbert is here to save the day!...or contribute to the next outbreak of Beaver Fever. Update today and build the Zoo of your WILDEST dreams!"

- Event description on app store.

The Simpsons: Tapped Out Moe's Ark is the one hundred and seventy-second content update, and was released on August 1st, 2018. It was teased in the update. It added 3 new characters, 5 new building-character combos, 3 new decoration-character combos, 2 new character skins, 8 new buildings and 42 new decorations.

Day Old Donut
The offer seems to be random.

July 31st Update (4.34.0; "4_34_MoesArk")

 * 's update and content was removed from the game.
 * The app icon, the splash screen and the friend visit's icon were changed to new ones for the event.
 * A new music has been added in the background.
 * The town center was set to Springfield Zoo Entrance.
 * Event Daily Challenges were added.
 * The decorations limit was increased to 11,700.
 * A system message was added making note of the button that was added to Injury 500, Log Ride and Zoominator to turn ride animations on/off.
 * Norbert's Listen to Grampa Babble job was fixed.
 * A new Character group was added, Wiggum Family: Wiggum, Ralph and Sarah Wiggum.
 * Bart's Treehouse now requires either Level 9 or Pinkbeardy Yogurt quest to be started.
 * Allison Taylor, Boittany Brockman, T-Rex and Tennage Homer can now Bounce on the Moonbounce.
 * Space Coyote's Sniff Some Butts can now be done at Brown House too.
 * Viking Boat Ride can now be rotated in 4 directions.
 * Poochie's Pretend to be in a Car Chase job now requires Poochie's Car, and Poorly Working Title Pt. 6 or Recycling to the Extreme Pt. 5 started.
 * Youngsters' Watch Poochie Ironically job was removed.
 * Duff Gardens promo was fixed.
 * Even More Kids and The Serfons' character groups screen now scroll.
 * Deluxe Condo, Valet Parkin, Business Center, Classic Mansion, Modern Mansion and Private Island's Bonus XP now applies to $ too.
 * Roller Coaster Weirdos are now placed correctly.
 * Moe's Cavern build time is now 6s instead of 4h.
 * Sophie Krustofsky is now premium.
 * Springfield Elementary can be unlocked also by starting No Me In Talent Pt. 4 to be started.
 * Moe's Tavern can be unlocked also by starting Spoon Is Mightier Than the Sword Pt. 1, Coming to Springfield Pt. 1 or Kill Burns Pt. 2.
 * Springfield Penitentiary can be unlocked also by starting Spoon Is Mightier Than the Sword Pt. 2.
 * Hibbert Family Practice can be unlocked also by reaching Level 5 during the event.
 * Wiggum House is now visible in the store also by starting Family Fun Pt. 1.

August 2nd Update ("4_34_MoesArk_Patch1")

 * 's update and content was added back in the game.
 * Giant Lobster Scorpion's Bonus $ and XP was changed from 23.5% to 2.5%.
 * Placing Animal Habitat Wall (Small) now yields instead of.
 * Placing Animal Habitat Wall (Big) and Springfield Zoo Wall now yield instead of.
 * Placing Stacking Sheep now yields instead of.
 * Placing Zoo Viewing Platform now yields instead of.
 * Placing Zoo Lion Statue, Zoo Elephant Statue and Zoo Anteater Statue now yield instead of.
 * Placing Marine Fountain now yields instead of.
 * Placing Butterfly Garden and Marine World Sign, Wet 'N' Wacky World Sign and Wild Animal Kingdom Sign now yield instead of.

September 6th Update (Moe's Ark Beta Corrupted Update - Removed)
A corrupted update, presumibly beta from the Moe's Ark event, was released on September 6th. Just a little over an hour later, the update was reverted.
 * 's update and content was removed from the game.
 * Springfield Zoo Wall's colours were changed.
 * Deluxe Condo, Valet Parkin, Business Center, Classic Mansion, Modern Mansion and Private Island's Bonus $ was reverted.
 * Some text from the event was removed.
 * Some glitched graphics on Android were fixed.