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.
They drink the flower nectar and are the only bâ¦ird that can fly backwards. A tiny bird with muscles that can make it fly in any direction and stay in one spot while drinking nectar. They are very fast and feed off of bugs also.    I assume that you were referring to a Hummingbird. Hummingbirds are birds comprising the family Trochilidae. They are among the smallest of birds, and include the smallest extant bird species, the Bee Hummingbirds.