Let’s ignore insects for the present. What I’m asking about can hover, elevate straight up or down, go backwards and yes, even fly upside down. You’re right- it’s a hummingbird.
These guys-who are the smallest of birds- can come in at half the weight of a sheet of paper (approximately 2 grams). They have one of the animal kingdom’s highest metabolic rates: their heartbeat is approximately 500 beats…
