Ruby-throated Hummingbird. The name really only applies to the male of the species. The female has a creamy white throat and belly.
They are amazing little animals.
As part of their spring migration, portions of the population fly from the Yucatan peninsula of Mexico across the Gulf of Mexico, arriving first in Florida and Louisiana. This feat is impressive, as a 800 km (500 mi), non-stop flight over water would seemingly require a caloric energy that far exceeds an adult hummingbird’s body weight of 3 g (0.11 oz). However, researchers discovered the tiny birds can double their fat mass to approximately one gram in preparation for their Gulf crossing, then expend the entire calorie reserve from fat during the 20 hour non-stop crossing when food and water are unavailable.
Hummingbirds have one of the highest metabolic rates of any animal, with heart rates up to 1260 beats per minute, breathing rate of about 250 breaths per minute even at rest, and oxygen consumption of about 4 ml oxygen/g/hour at rest. During flight, hummingbird oxygen consumption per gram of muscle tissue is approximately 10 times higher than that seen for elite human athletes.
They feed frequently while active during the day. When temperatures drop, particularly on cold nights, they may conserve energy by entering hypothermic torpor.
Muscles make up 25–30% of their body weight, and they have long, blade-like wings that, unlike the wings of other birds, connect to the body only from the shoulder joint. This adaptation allows the wing to rotate almost 180°, enabling the bird to fly not only forward but fly backward, and to hover in front of flowers as it feeds on nectar or hovers mid-air to catch tiny insects. Hummingbirds are the only known birds that can fly backward.
During hovering, (and likely other modes of flight) ruby-throated hummingbird wings beat 55 times per second.