It's a fairly large beetle that belongs to the Meloe genus of beetles. This is the beetle on the tip of my gardening glove finger. It had an iridescent blue colour, but if you look closely, you will see that it has exuded some greenish "goo" (scientific terminology there!) from a couple of its leg joints on the right side, and also its back end.
I was under the impression that this was an injured beetle that was leaking goo due to having been attacked by some other insect. However, when I looked up the species, that's when I learned that oil beetles exude droplets of hemolymph (the insect equivalent of blood) from their joints when they are disturbed. I had disturbed it by picking it up. Good thing that I was wearing the gloves though, because that hemolymph contains cantharidin, which can cause severe skin blistering. This is why this family of beetles also have the name of "blister beetles" in addition to the oil beetle name.
Livestock exposure to cantharidin (by inadvertent contact with or ingestion of the beetles) can be a serious problem requiring veterinary care, especially in horses. If humans ingest it, a dose as low as 10 mg can actually be fatal! Yikes! Fortunately, I'm not in the habit of licking beetles.