These are just theories on the ancestors that grew up with the Irkens. I'm just going to give the nutshell version and I will post full a full analysis on each of species in way more depthin the next chapters.
0-Irkens -Normal
Location: They thrived in the tropical zones of planet Irk.
Appearance: They are green and shorter in stature they have large eyes. Males have bent antenna while females have curled antennae. Females use to have wings.
Natural predator: Laberalmathe (Very huge black monster bug)
Reason for life: Their natural predator died during the Global Warming Period about 5.93 billion years after plant creation. This allowed them to thrive.
0-Kerins - Danger
Location:Underground caverns of Irk.
Appearance: Blue green tones large eyes and with fluff on antennae, sharp teeth barbed hands and feet. Females have curled antenna while males have strait antennae.
Natural Predator: None
Reason For Extinction: Food source extinction. Young could no longer feed themselves.
(Recently brought back by scientists and are now a major problem.)
0-Berkenas - Extinct
Location: Temperate Forests of Irk
Appearance: Yellow orange skin, large eyes with white mane. Two sets of Membranous wings. Females are 300 times larger then males and have large antennae.
Natural Predetor: None
Reason For Extinction: Global Warming Period wiped out many giant flowering plants destroying food supplies.
0-Warkwas - Extinct
Location: Deep Marshlands and lakes
Appearance: Reddish skin to Blue skin, smaller eyes, hinged legs can walk on water. Female and males are both the same with large antennae.
Natural Predator: Aquiorter (Large serpent fish)
Reason For Extinction: Global Warming Period died up most of the swap destroying their habitat and food source.