Where did twilly get his vulture beak necklace

While Marta wonders if the the vulture beak necklace that Twilly gives her has a magical meaning, in this case it symbolizes being in tune with nature, resourcefulness, loyalty, and patience which are all traits that Twilly has which he is passing on to Marta when he gives her the necklace. Indeed, once she gets it, she plays her role while she patiently waits for Nick to play his role without complaining about bugs or wondering when they could go home.