The Blue-collared Parrot, Geoffroyus simplex, also known as Simple Parrot, Lilac-collared Song Parrot, or Lilac-collared Geoffroy's Parrot, is a parrot found in the higher elevations of New Guinea. It is found from 500-2300m, mainly between 800-1900m (though food shortages will send them lower). It is 23-25cm, mainly green with a black beak, yellow wing bend, blue underwing coverts, and a pale yellow iris. Adult males have a blue collar across upper breast to lower neck above the mantle, adult females have some blue on the rear crown. Juveniles have no blue and a paler bill. There are two subspecies:

• G. s. simplex: On Vogelkop. 23cm
• G. s. buergersi: On rest of island. 25cm, collar on males is duller but wider in back.

It inhabits humid hill forest and forest edges. Flocks are up to 200.