These are an essential. To get these EXTREMELY easy early game, tame a pteranodon and pump all its levels into stamina. Go to the Valguero Wyvern trench as it is the easiest in my opinion. Then time it perfectly and head in and grab the FIRST egg you see and dip as fast as you can. The level doesn’t matter because once you have one Wyvern you have unlimited basically. Do not stop until you are out of the snow area because they WILL catch up to you.
To know how much time need to the next feeding just do the next. Look the Food number# then that number multiply x 10, then divide /3600 and the result will be the number of hours until the next time need to be fed. F.E the food number is 1850.5 1859.5x10=18595 /3600 = 5.1 hours