All of the problems I've ever had with species identification have come from raccoon skulls.
Madness string 7566
I don't believe there are subjects that are inappropriate for children. There are inappropriate ways of telling these subjects. So tell them proper. Kids know there are horrors, so tell them the names of the horrors. Tell them these horrors, as with all things, can be fought. Give them the tools, and show them ''how''.