Zelena is known for transforming people into primates so it’d make sense that Emma would go to her to ask how it’s done… BUT Emma is the Dark One and we’ve seen her do some powerful magicks on her own. I don’t see why a transformation spell would be out of her field of knowledge. Especially when she’s got MindRumpel in her head to give her some pointers.
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"I could have the giant duck as my steed!" --Daniel Radcliffe
Keeper Of Tamara's Taser , Jafar's Staff, Kitsis’s Glasses , Ariel’s Tail, Dopey's Hat , Peter Pan’s Shadow, Outfit, & Pied Cloak,Red Queen's Castle, White Rabbit's Power To World Hop, Zelena's BroomStick, & ALL MAGIC