Learn how to identify an orchard oriole. For 22 years, from 1973 to 1995, Baltimore and Bullock’s orioles were called ... lays three to six pale gray-blue eggs, which take two weeks to hatch.

The orange supercilium, black eye line, and solid white wing patch are diagnostic for the adult male Bullock’s. The female and the immature can be confused with a dull Baltimore oriole.

When will Baltimore orioles arrive in spring? The Baltimore oriole’s close relative, the Bullock’s oriole replaces it in the western half of the continent. Where the two types meet on the ...