Greater Bird of Paradise 50 Rupiah Indonesia Authentic Coin Money for Jewelry and Craft Making (1971)

Greater Bird of Paradise 50 Rupiah Indonesia Authentic Coin Money for Jewelry and Craft Making (1971)

Reverse: Greater Bird of Paradise (Paradisaea apoda) on a branch, facing left
Lettering: Rp 50

Obverse: Large numerical denomination surrounded by legend
Lettering: BANK INDONESIA
50 RUPIAH
1971

Edge: Milled

Features
Issuer Indonesia
Period Republic (1950-date)
Type Standard circulation coin
Year 1971
Value 50 Rupiah (50 IDR)
Currency Rupiah (1965-date)
Composition Copper-nickel
Weight 6.06 g
Diameter 24 mm
Thickness 1.7 mm
Shape Round
Technique Milled
Orientation Medal alignment ↑↑
Demonetized 26 June 2002
Number N# 3083
References KM# 35, Schön# 25

Wikipedia:
The greater bird-of-paradise (Paradisaea apoda) is a bird-of-paradise in the genus Paradisaea.

Carl Linnaeus named the species Paradisaea apoda, or "legless bird-of-paradise", because early trade-skins to reach Europe were prepared without wings or feet by the indigenous New Guinean people; this led to the misconception that these birds were beautiful visitors from paradise that were kept aloft by their plumes and never touched the earth until death.

Description
The greater bird-of-paradise is the largest member in the genus Paradisaea, with males measuring up to 43 cm (17 in) (excluding the long twin tail wires). The female is bigger, at 48 cm (19 in). The plumage of this species is also sexually dimorphic. The male has an iridescent green face and a yellow glossed with silver iridescence crown, head and nape. The rest of the body plumage is maroon-brown. The flank plumes, used in displays, are yellow at the base, turning white and streaked with maroon. The female has unbarred maroon brown plumage. In both sexes the iris is yellow and the bills blue.

Courtship and breeding
Male greater birds-of-paradise, as polygynous breeders, experience female selection, in which females choose male mates based upon indirect genetic benefits which increase offspring fitness. Since males do not contribute to offspring in any other way (i.e. through parental care), females have to assess male fitness through courtship rituals, details of which are in the following sections.

Dances
Males display in trees above the ground and congregate in a lek or “court” versus individually displaying for females. Males will initially congregate around common display areas on a secondary perch, away from the main viewing perches available, and flap their wings rapidly. They will then move to the main viewing perches, erecting their large plumes at their rumps over their backs and extending their wings (Pose 1). They subsequently depress their bodies close to the branches that they are on, retract their wings, leave their tail plumes erected, and prance or charge along their branch (Pose 2). The birds will then freeze with their bills pointed downwards, wings extended once again, and tail plumes still upright (Pose 3). Males will assume this last position, referred to as the “flower position” when females are present, for inspection purposes, but will refrain and remain in position two, moving in synchrony, when females are absent.

Males will often visit each other's display grounds, located relatively close to each other, but will perform the majority of their displays at a common court. Other courtship behaviors outside of the physical dance can consist of bill-wiping, in which the male pauses the dance and brushes both sides of his beak on the branch, as well as leaf-tearing, hanging upside down from the branch, and vocalizations.

Calls
Males use eight variations of calls, commonly referred to as “wauks” within courtship rituals, each linked to a section of the courtship dance:

Rising call: A series of four or five “wauks” repeated at one-second intervals. The first two notes are of approximately equal volume and the subsequent two or three are of increasing volume and intensity.
Rapid wauk call: A series of quick “wauks”, all of the equal volume, delivered in bursts of several per second, accompanied by wingbeats. These calls are usually performed when a female is in the vicinity and in correlation with pose one.
Wing pose call: The only non-“wauk” call, this vocalization consists of piercing “ee-ak” notes repeated multiple times. This call is accompanied by the posing of the wings (pose 1) and alternated with the rapid wauk call.
Pump call: A much faster version of the rapid wauk call, to the point where the sound of the call meshes into a single sound of “wa-wa-wa.” These calls last up to ten seconds.
Baa call: Following the pump call, males will perform several nasal “baa” notes combined with movement into pose three.
Nasal call: A more sudden and nasally version of the baa call given after the male leaves the primary viewing branch around the court.
Chugich call: Can be performed prior to the click call or after the nasal call; consists of a guttural “chug’ich” note.
Daily display rhythm

Males spend the majority of their time during mating seasons at their respective display grounds. They begin calling before sunrise and cease shortly after sunset. They feed very briefly and infrequently, moving away from display grounds in the heat of the afternoon, and returning before dusk. This mating behavior most commonly occurs between March and May, and again August through December, but can occur during other parts of the year as well.