Mini building block set for ages 12+ containes 460 pieces with an asssembled size of 4 1/4" x 4 13/16" x 5 1/8". Hummingbirds are named after the humming noise their wings make in flight. Most hummingbirds can flap their wings from 50-80 beats per second and when they dive, they can flap their wings up to 200 times per second! They are the only species that can fly backwards and hover for long periods of time. There are over 350 hummingbird species.