A recent archaeological dig near Guernsey has yielded something rather unexpected - a porpoise skeleton.
The Mexican government is hoping to use specially trained dolphins to save the vaquita porpoise.
Discovered off the coast of the Netherlands, the specimen is the first of its kind ever found.
Despite efforts by authorities, the vaquita porpoise is now the world's most endangered marine mammal.
Dolphins are often considered to be gentle, intelligent creatures but a series of porpoise killings has revealed their darker side.