It's not a secret, it's just something that is "extra" going on with the animal. Similar to Ralph's Platty Daddy having a hidden gene.
I definitely can't explain it in a cohesive way, so I'll let our genetics specialists take a swing at explaining it!
i dont think they got the message LOOL
"So far this is the oldest that I've been"
'If you can make it through the nite, there's a brighter day'
"I'm out the game, put the 2nd string in."
"live with the pain and keep trying or die knowing you never gave anything a chance"
"Death is not the greatest loss in life. The greatest loss is what dies inside while still alive"
"No one can take away your dreams"