▁the ▁nest ing ▁season ▁begins ▁when ▁river ▁levels ▁drop ▁and ▁continue ▁until ▁the ▁Mon so on ▁ra ins . ▁In ▁court ship , ▁the ▁male ▁sho ots ▁into ▁the ▁air ▁with ▁a ▁single ▁wing ▁beat , ▁s ings ▁and ▁gl ides ▁with ▁d ang ling ▁legs ▁and ▁pu ff ed ▁fe athers . ▁On ▁sett ling , ▁the ▁tail ▁of ▁the ▁male ▁is ▁raised ▁high ▁and ▁wings ▁held ▁up ▁over ▁the ▁back ▁and ▁the ▁tip ▁is ▁qui ver ed ▁st iff ly ▁while ▁he ▁steps ▁around ▁the ▁female . ▁The ▁female ▁respond s ▁by ▁cr ouch ing ▁and ▁sh iver ing ▁the ▁wings ▁as ▁if ▁begg ing ▁for ▁food . ▁ ▁It ▁builds ▁its ▁cup - sh aped ▁nest ▁placed ▁on ▁the ▁ground ▁or ▁rocks ▁in ▁a ▁hole , ▁led ge ▁or ▁mud ▁bank ▁and ▁is ▁always ▁located ▁close ▁to ▁water . ▁Art ific ial ▁structures ▁such ▁as ▁brid ges ▁and ▁roof ▁to ps ▁are ▁also ▁used . ▁N ests ▁have ▁been ▁noticed ▁in ▁a ▁regularly ▁used ▁fer ry . ▁The ▁nest ▁is ▁made ▁of ▁grass , ▁roots , ▁alg ae ▁and ▁other ▁material ▁with ▁a ▁central ▁neat ▁cup ▁l ined ▁with ▁hair . ▁Norm ally ▁four , ▁and ▁three ▁to ▁five ▁eggs ▁is ▁the ▁usual ▁cl utch . ▁ ▁Food ▁Like ▁other ▁w agt ails , ▁this ▁species ▁is ▁insect iv orous . ▁N est lings ▁were ▁mainly ▁fed ▁orth opter ans , ▁c ater p ill ars ▁and ▁sp iders . ▁St ay phy lin id ▁be et les ▁and ▁pent