Though the cardinal was once kept as a pet due to its beautiful coloration and unique song, it is now protected by the Migratory Bird Treaty Act of 1918. Though protected, they are not considered endangered and they may number as high as 100 million. The bright red northern cardinal is one of the Cardinalidae family, which also includes buntings, tanagers and grosbeaks. The three members of the genus Cardinalis include the northern cardinal, the vermillion cardinal, and the pyrrhuloxia, all of which feature short crests on their heads and reddish coloring, although the pyrrhuloxia is mostly brown with reddish accents. Recommended Age: 3+. Size in cm: 12.3 L x 4.5 W x 4.8 H. Size in inches: 4.84 L x 1.77 W x 1.89 H.