The length of the legs will depend on the body type of the bird. Some birds that have long legs include:
Storks, ostriches, emus, herons, ibises, flamingos
It could be an Ostrich, Emu or Flamingo. There are many birds with long legs.
Ostrich
Flamingos
ostrich
Herons.
Ostrich
ChickCivetCrakeCrane
Kill deer
blue heron
Little blue heron.
to capture its prays and clutcher twigs for nesting
It can reach a leg span of up to 12 inches long