Simplify the following text for a Grade 11 native English-speaking person.
Original: One of the species in this genus , the Red Junglefowl , is of historical importance as the likely ancestor of the domesticated chicken , although it has been suggested the Grey Junglefowl was also involved .
Simplified: One of the species in this genus , the Red Junglefowl , is of historical importance as the likely ancestor of the domesticated chicken .