SHANSHEETH

The Shansheeth are species of avian bipeds. Two meters tall, they have hunched shoulders with a long neck protruding from the middle section of their body and a vulture like head. They have five digits clawed hands and feet. Apart of their head, neck, feet and hands, most of their body is covered in feathers. They are able to project energy beams from their hands and like wearing robes and jewels.

A peaceful advanced space faring civilisation led by a political enitiy known as the Wide Wing of the High Shansheeth Nest, they have been known amongst the interstellar community as galactic undertakers, journeying through space in tribal groups to return lost heroes to their kin. .They employ shards of black stones called epitaph sotnes which they use to project hologrphic images to communicate with other species and  have also been known to use devieces called memory weaves to extracting memories and turning them into physical objects.

 Source: Doctor Who Universe (SJA: Death of the Doctor) 

ALKARI

Planet of Origin: A planet in the Altari system

Alkari are an honorable but aggressive species of avian bipeds which developed an interstellar space faring civilisation. Alkari are slowly evolving from avian to reptilian. They are at war with the Mrrshan.
Home System: Altair
Source: Master of Orion

FIREKKANS

Edited from the WCNews.com entry.
Planet of Origin: Firekka
The Firekkans are an avian species that resemble seven-foot tall predatory birds. Firekkan males are slightly smaller than their female counterparts.
Firekkan culture relies heavily on a matriarchal flock system. Firekkan society values the interests of the flock, which consists of a matriarch and her family, above those of the individual. This creates a stable society, but one that can have difficulty adapting to new things unless it is forced to. Each flock grooms a specific child from birth to become flock leader. A flock leader leads her flock in many aspects of life. According to the tenet of the Living Spark, the acts of a flock leader shape the flock and the future. The overall leader of Firekkan culture, the 'Flock Leader of Flock Leaders', is known as the Teehyn Ree. Because of the strong subordination to a flock, and the flock's desire to remain close, few Firekkans, at least in the past, have left their flocks to go out into space.
Firekkan religion and philosophy are very spiritual and are based heavily on imagery of flight and nature. Midnight ceremonies are held at the Firekkan Fire-Temples. Firekkans commonly follow the Flame Winds doctrine, which emphasizes living in the moment and not worrying about the future or planning ahead. Any occurrence can undo any plans, so it is futile to plan ahead. The Firekkans also participate in a number of flying dances used for a number of purposes from bonding to mourning.
Firekkans are very social creatures, and as such have a complex system of greetings, gestures and customs. The first thing an outsider will notice is the Firekkan greeting. To be sure that their acquaintance will be free of pests during while in their company, Firekkans greet each other by searching the feathers, hair, or fur of their acquaintance for parasites and bugs. Also, an outsider should note that Firekkans display their amusement by leaning backwards and clattering their beaks in a gesture similar to human laughter. Other notable things include the ducking of one’s head between the shoulders when embarrassed and the involuntary moulting when frightened.
Firekkan architecture is distinct in that it is created for a race with flight. Buildings are arranged without stairs, or fences at large drops, which can be quite disconcerting to visitors. Bars and pubs have perches for their patrons, instead of chairs. Firekkan pubs are, quite probably, most famous for their potent alcoholic drink known as Firekka’s Finest. Along with socializing over a Firekka’s Finest, Firekkans have a number of recreational activities, including flight races.
The Terran Confederation made contact with the Firekkans in 2653, and pledged to protect them while Firekkan entry into the Confederation was negotiated. Shortly after this contact with the Confederation, the first Firekkans left their flocks and planet to travel between star systems.
By the year 2678, the Firekkan Planetary Alliance had been created and the Firekkans had claimed the nearby star system of T'kirsa.
Source: Wing Commander Universe

SKORR / AURELIANS

 Planet of Origin: Aurelia, the 2nd planet orbiting the star Xi Herculis, 160 light years from Earthm, in the Milky Way galaxy

The Skorr are bipedal avians with lifespans spanning hundreds of years. They are feathered and stand from two to three meters tall. There body is much like that of a winged humanoids with bird legs and head.

They have developed a space faring civilisation and have long existed as a warrior monarchic culture with advanced technology and the ability to breed vast armies very quickly until the mid-21st century, when the philosopher Alar lead his race into a new era of peace. After Alar's death, his thought patterns were preserved in an indurite sculpture referred to as the "Soul of Skorr."

Source: Star Trek: The Animated Series: “Yesteryear”, ‘The Jihad”