Diminutive

Calliope Hummingbird
smallest North American bird
Length is 8cm (3 1/4 inches)

Imagine these diminutive birds (weighing less than half an ounce)
flying all the way from west central Mexico to breed and raise their
young in the forests and mountains of central British Columbia.

They return here every May, like clockwork, and sometime
this month, they will take on another amazing feat when
they begin their fall migration back to Mexico.