There are several youtube videos of either Isle of Mull or an t-Eilean Muileach.

This one, in Gaelic, has French translation on screen
https://www.youtube.com/watch?v=aK46kSqU0Gw

The verse Keberozu quotes is also published in
"A' choisir-chiuil : the St. Columba collection of Gaelic songs, arranged for part-singing"

Gheibhteadh 'n ruadh-chearc 'sna coilltean ìosal,
'S a coileach tùchanach dlùth 'ga brìodal;
'S ged bha na beanntan gun fhaing, gun fhrìthean,
Bha daimh na cròice 'nan còrsaibh lìonmhor.

The red grouse hen (ruadh-chearc) would be found in the lower woodlands
And her gruff-voiced (? tùchanach ) cock beside her wooing her
Amd though the bens* were without fanks (?)** and without deer forests
The antlered stags of the coast (?) would be numerous.

*(mountains/high hills)
** aka sheep pens/ but fang is also a word for a vulture

For lyrics and recordings and information in Gaelic on the author, see http://www.bbc.co.uk/alba/oran/orain/an_t_eilean_muileach/