Cardinals are essentially seedeaters which eat a lot of insects, buds, fruit/berries etc., as available. When breeding in particular they become highly insectivorous.
The cardinal is a songbird of the fringilidae family, new world seedeaters, They are closely related to grosbeaks, in fact, the old name was cardinal grosbeak. They begin to sing in March in the...
Cardinals nest in spring, building nests of grasses and twigs, usually in cover such as bushes and hedgerows. The young hatch after around 13 days, and are independent in around six weeks of age.