OLogy: What's This? Breathing
OLogy (American Museum of Natural History)

Is this animal a tadpole, frog, salamander, or lizard? Take a guess!

But Why?: Do Bumblebees Have Hearts?
But Why?

Arthropods, including bumblebees have a heart that’s like a straw running down their back. Their open circulatory system bathes their organs with blood.