For sure only try to hatch the high level wyverns instead of the low levels. Low levels require more milk to tame. Also another good tip is that Wyverns cant hurt each other if they are the same element and that goes for both wild and tamed
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.