A thought:
The selkie myth, but applied to wyverns. The shawl is their wings, and if you can find where they've hidden it when they come down to the ground, then you have the wyvern as yours until they find where you've hidden their wings.
Probably best not to be around when they find it, a wyvern can do a lot more damage than a seal.
@Aradia Your average wyvern is like the size of a cottage tho. Like, a seal can mess up your car, a wyvern can break your architecture.
@Soreth
"a wyvern can do a lot more damage than a seal."
Um https://youtu.be/IpT1u2lFkXs?t=101