timelets

https://www.nytimes.com/2018/03/20/science/hummingbirds-fructose-metabolism.html

Their wings can beat 80 times a second. Their hearts can beat more than 1,000 times a minute. They live on nectar and can pack on 40 percent of their body weight in fat for migration.

But sometimes they are so lean that they live close to caloric bankruptcy. At such times, some hummingbirds could starve to death while they sleep because they’re not getting to eat every half-hour or so. Instead they enter a state of torpor, with heartbeat and body temperature turned way down to diminish the need for food.

A cross between humans and hummingbirds could survive a flight to Mars and beyond.