The colorful birds can be identified by their larger, deeper bills, but they also have different calls than the other ecotypes of crossbills. (sciencedaily.com)
«Their vocalization, their flight call, is how we can categorize the crossbill ecotypes in the absence if information on their bill sizes.» (sciencedaily.com)
These whales turned out to be the mammal - eating ecotype who feed on a variety of other marine mammals, one of which being, Steller Sea Lions. (stubbs-island.com)