There is no evdence that the grave in question, was dug up by animal rights protesters.

Why would they?

This smacks of dirty tricks, by the pro vivisection lobby.

Demonise the enemy.

Btw. Huntingdon Research Centee were the subject of an undercover television investigation, which resulted in several convictions for animal cruelty.

Later, their director Brian Cass was strangely awarded an OBE.