Because the bird opens and closes it's long tail feathers, resembling scissors.
The Scissor-tailed Flycatcher got its name by the fact that its tail is shaped like scissors and opens up when it sees and catches a fly.
Flycatcher starts with FL.
Flycatcher .
Mariqua Flycatcher was created in 1847.
Euler's Flycatcher was created in 1868.
Pygmy Flycatcher was created in 1854.
Vermilion Flycatcher was created in 1783.
Humblot's Flycatcher was created in 1885.
Pale Flycatcher was created in 1851.
Willow Flycatcher was created in 1828.
Chapada Flycatcher was created in 2001.
Guam Flycatcher was created in 1881.