Only one Ohio
O-HI-O
a red-eyed vireo is a bird that ends in "o"
Buffalo is not really an antelope, but it is the closest relative to the antelope where the name ends with an o.
to.....
An Italian company name that begins with "R" and ends with "o" is Roncato.
Amoeba
· echo
mosquito
Avocado
overdo
Coho salmon which is also known as silver salmon.