The primary physiological cue for migration may be the variations from the working day size. These variations are connected to hormonal adjustments within the birds. While in the period of time ahead of migration, many birds display higher activity or Zugunruhe (German: migratory restlessness), 1st explained by Johann Friedrich Naumann https://saveonpetsuppliesdubai94680.alltdesign.com/a-simple-key-for-parrot-care-basics-dubai-unveiled-56547661