Montauk Monster, a hairless beast that washed up on a New York beach in 2008. Another was found in the same area a year previously.
In each case the bodies have digits rather than hoofs have large fangs, are hairless and do not look like any known animal.
Each creature was claimed by a government agency and were disposed of without any testing being done on them.
We've known for years about the various genetic experiments that have been done to create animals that can be used in warfare and others that are living organ donors for humans.
Sometimes they escape.