My tibemate got a poison, lightning and fire on my buffed hatching and maturing server. The fire was a 40% imprinted 403 level [It takes meat instead of milk but not when imprinting on my server.] It was my god. A day later I die with it, it escapes on passive and I lose it. A week later I get a death noti it died to a higher level rock drake [again, my server.] Sad times am I right. So don't die with a wyvern. Good news! I went at got a poison with no tribe help just a pter but then again, it's a poison.
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
A fire wyvern is one of the best you can have because they are resistant to fire damage so alpha wyverns are much easier to kill same with all the wyverns they can't hurt each if they are the same element but the bite attack still works on all wyverns keep this in mind