How Aliens Would Reconstruct The Animal - A Hard-to-Destroy-Cetacean

"Wait, SCP 682 is based on a whale skull?"
"Always has been."

682 spends 60 percent of its time wallowing in an acid bath, 25 percent of the time having the Foundation trying new and exciting ways to kill it, and the remaining 15 percent rampaging through the facility trying to kill as many people as possible. You'd probably be pretty beaten up with a schedule like that, I don't care how regenerative you are.