American Redstart birds belongs to the Warbler family
The photos here are of an immature male. They are found in eastern and northern U.S. and southern Canada. They will spend their winter in northern South America, Central America, Caribbean, southern and western Mexico, southern Florida and California.
The birds will spread their tails, in a fast flash, to try and startles insects, to make them move so that they can find and catch them. Some of the food that they like to eat; moths, wasps, flies, and beetles. They also like small berries and fruits.