A person whose appearance matches these characteristics is said to be a Caucasian. Caucasians don't always have white skin but in the United States caucasian is commonly used to mean white people. Caucasians are found in many countries around the world. So while a Caucasian person in the United States may share certain racial characteristics with a Caucasian person from France, the two people have different ethnic backgrounds â one American, the other French.
Make sure you know when the baby birds are due to fledged. This occurs at different times depending on the species; for example, bluebirds fledged at days 16-21, tree swallows at days 18-17 and purple martins at around 20 days. Open nesters generally fledged around day 12, while cavity nesters stay longer.
Actually, wrong. By comparing the European Swallow with bird species of similar body mass, we can estimate that the swallow beats its wings 18 times a second with an amplitude of 18 cm: Note that even the tiny Zebra Finch flaps its wings no more than 27 times a second while cruising.