For 24 hours, The Mystery Stables / Secretive Stable master can be purchased for just 15 BB, at the Supply Store
The Secretive Stable Master offer will end in :
Once bought, you'll find the animal-seedling in your Animal Tab, top line:
You place it on a 2x2 empty square, and wait 5 hours
After 5 hours, click on your Secretive Stable Master,
you will receive
400 EP and your Secretive Stable will change into either: - a Classic Stable I or Yellow Upgrade (up to your actual level) - a Classic Stable II or Orange Upgrade (up to your actual level) - a Production Farm (up to your actual level) or could even change into New Stables, Rare Stables:- RARE - - Moose Reserve- RARE - - Kangaroo Shed- RARE - - Bat Roost- RARE - - Reindeer Stable- RARE - - a "birthday edition sheep pen" 
The Birthday Sheep Stable gives 2 sheep, and 75 EP every 10 hours with sheep feed, or 8 hours with water.- NEW - Butterfly House
Gives; 70 EP Requires: 1 butterfly feed (10 sunflowers) time 12h with water 9h36 power-feed 6h power-feed + water 4h48- NEW - Squirrel Hut
Gives: 80 EP Requires: 1 Squirrel Feed (1 walnut, 1 apple) time 14h water 11h12 power-feed 7h power-feed + water 5h36- - - - - here is an example of how the "change" happens: 
You might need to refresh (F5) to see the new stable.
