There are two types of atomic bonds-ionic bonds and covalent bonds. They differ in their structure and properties. Covalent bonds consist of pairs of electrons shared by two atoms, and bind the atoms in a fixed orientation. Relatively high energies are required to break them (50â-â200 kcal/mol).
Hummingbirds fly by day when nectar sources such as flowers are more abundant. Flying low allows the birds to see, and stop at, food supplies along the way. They are also experts at using tail winds to help reach their destination faster and by consuming less energy and body fat. Research indicates a hummingbird can travel as much as 23 miles in one day.
One of the fastest birds is the green violet-ear hummingbird. It can fly up to 93 miles per hour (150 kilometers per hour) for short distances. Hummingbirds are so quick that they can easily escape predators like snakes, falcons, jays, toucans, and cats, unless they are taken by surprise.