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 .
Pygmy Flycatcher was created in 1854.
Vermilion Flycatcher was created in 1783.
Mariqua Flycatcher was created in 1847.
Fiscal Flycatcher was created in 1809.
Euler's Flycatcher was created in 1868.
Chapada Flycatcher was created in 2001.
Ward's Flycatcher was created in 1870.
Guam Flycatcher was created in 1881.
Cocos Flycatcher was created in 1895.