Fork-tailed \Fork"-tailed`\, a. (Zool.)
Having the outer tail feathers longer than the median ones;
swallow-tailed; -- said of many birds.
[1913 Webster]
{Fork-tailed flycatcher} (Zool.), a tropical American
flycatcher ({Milvulus tyrannus}).
{Fork-tailed gull} (Zool.), a gull of the genus {Xema}, of
two species, esp. {X. Sabinii} of the Arctic Ocean.
{Fork-tailed kite} (Zool.), a graceful American kite
({Elanoides forficatus}); -- called also {swallow-tailed
kite}.
[1913 Webster]