I got a level 150 lightning egg and I was so excited to hatch the egg...that when I went to put the egg down I accidentally ate it instead. :( ps4 users: R2 ISN'T GONNA DROP THE EGG YOU'RE GONNA EAT IT LIKE ANY OTHER EGG. REMEMBER THIS. LOGIC BEFORE EXCITMENT.
This is really not the best idea if you don’t want tames killed, but a great way to steal eggs is to tame 7-8 pteranodons and only saddle one of them(to ride) and have them follow you into the ravine and once you steal the egg, whistle aggressive which will divert the wyverns focus onto the other pteras, leaving you to escape with the egg(s)
This Is my guess/hypothesis if you leave a wyvern egg sitting on its nest for a long time and you get it after so long you have a big chance of getting triplets. Trust me I did it my first wyvern egg and I got triplets.