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There are fifteen types of vireos in North America, nine of these vireos live or have been identified in Canada. These are the Bell's Vireo, Blue-headed Vireo, Cassin's Vireo, Hutton's Vireo, Philadelphia Vireo, Red-eyed Vireo, Warblering Vireo, White-eyed Vireo, and the Yellow-throated Vireo. The rest range mostly in the Southern States into Mexico. They are the Black-capped Vireo, Black-whiskered Vireo, Gray Vireo, Plumbeous Vireo, Thick-billed Vireo and the Yellow-green Vireo.
a small grayish bird
veto
Vireo Altricapilla.
Veto does not mean to accept. Veto means one rejects the idea completely.
If you are refering to Vireo, the genus of birds, the answer is no they are not mammals. They are avians.
vireo
The scientific or taxonomic name would be Vireo bellii.
The scientific or taxonomic name would be Vireo gilous.
A "veto" is used to prevent a law from becoming fully enacted.
Vireo
"veto" means 'I forbid', which is exactly how the term is used in international politics.