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 .
Euler's Flycatcher was created in 1868.
Willow Flycatcher was created in 1828.
Humblot's Flycatcher was created in 1885.
Cocos Flycatcher was created in 1895.
Pale Flycatcher was created in 1851.
Cinnamon Flycatcher was created in 1837.
Pygmy Flycatcher was created in 1854.
Vermilion Flycatcher was created in 1783.
Mariqua Flycatcher was created in 1847.