What's the Kennection? #182

Mellisuga helenae, the world's smallest warm-blooded creature, is the "bee" species of what animal?

What kind of stone did Michelangelo use to carve his David and Pietà?

What kind of animal was Bob, the host of the Intertidal Zone comic book created in 1989 by marine biologist Stephen Hillenburg?

What's the name of the alternate dimension where the Demogorgon lives on Stranger Things?

What vast German woods is the source of the Danube River?

What's the "Kennection"?