These are a hard dino to get you cant tame them so you have to steal there egg super easy if you have a friend and 2 dinos a giga and a desmodus or any fast flying dino so grab the egg and fky behind the gigas tail thw wyvern will agro to giga then your friend will kill the wyverns and then do that again and again

If without a friend put the giga to a easy access spot and then hop off the desmodus and hop on giga and kill them simple