The term 'Scarlet Bird' can refer to two different species of birds. The first is the TANAGER, which is a type of songbird that is found in tropical and subtropical regions of the Americas. It has bright red plumage and is known for its vibrant colors. The second bird is the CARDINAL, which is a type of passerine bird found in North and South America. It is also brightly colored, with a distinctive red head and crest. Both of these birds are popular among birdwatchers and are often seen in backyards and parks.