▁sources ▁enable ▁c ran es ▁to ▁stay ▁in ▁the ▁same ▁location ▁throughout ▁the ▁year . ▁Mig rat ory ▁populations ▁are ▁also ▁known ▁from ▁S out heast ▁Asia ▁and ▁Australia . ▁In ▁S out heast ▁Asia , ▁c ran es ▁con greg ate ▁in ▁few ▁rem nant ▁wet lands ▁during ▁the ▁dry ▁season . ▁In ▁Australia , ▁f lock s ▁aggregate ▁on ▁the ▁A ther ton ▁High lands , ▁where ▁agricult ure ▁is ▁condu ci ve ▁for ▁sar us ▁c ran es . ▁ ▁Bre eding ▁pairs ▁maintain ▁territ ories ▁that ▁are ▁def ended ▁from ▁other ▁c ran es ▁using ▁a ▁large ▁re per toire ▁of ▁calls ▁and ▁displays . ▁In ▁U tt ar ▁Pr adesh , ▁less ▁than ▁a ▁t enth ▁of ▁the ▁bre eding ▁pairs ▁maintain ▁territ ories ▁at ▁wet lands ▁while ▁the ▁rest ▁of ▁the ▁pairs ▁are ▁scattered ▁in ▁smaller ▁wet lands ▁and ▁agricult ural ▁fields . ▁Non - bre eding ▁birds ▁form ▁f lock s ▁that ▁vary ▁from ▁ 1 – 4 3 0 ▁birds . ▁In ▁semi - ar id ▁areas , ▁bre eding ▁pairs ▁and ▁successfully ▁fled ged ▁ju ven iles ▁depart ▁from ▁territ ories ▁in ▁the ▁dry ▁season ▁and ▁join ▁non - bre eding ▁f lock s . ▁In ▁areas ▁with ▁per enn ial ▁water ▁supply , ▁as ▁in ▁the ▁western ▁pla ins ▁of ▁U tt ar ▁Pr adesh , ▁bre eding ▁pairs ▁maintain ▁per enn ial ▁territ ories . ▁The ▁largest ▁known ▁f lock s ▁are ▁from ▁the ▁ 2 9   km 2 ▁Ke ol