POSC 201 – Chapter 2 Page 1 of 34 Chapter 2: Biological Systems of BirdsThere are ~100 billion birds on earth and only ~6 billion people for a ratio of ~17:1. The chicken is the most numerous domestic bird (~30 billion). The scientific name of our domestic chicken is Gallus domesticus(genus / species). Gallus domesticusis thought to be genetically derived from 4 wild species stillfound throughout Southeast Asia (see map below): * 1) Gallus gallus(Red Jungle Fowl) 3) Gallus lafayettii 2) Gallus varius 4) Gallus sonneratii *Considered to be the greatestgenetic contributor to Gallus domesticus Map of Southeast Asia indicating regions where four wild species of Gallusare still found.
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