The Otter, Mole, and Butterflies have indeed been replaced by the Rainbow Zebra, Rooster, and Bubble Frog.
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This is a special mini-event that lasts until the Mega-Sale ends on Monday. They can drop the same items as the Otter, Mole, and Butterflies, but in addition can drop PetCoins which can be redeemed for any of these three pets at the Farmer's Outpost. Get 'em while you can!