More material evidence exists for the ecology of B. advenus than for any other member of the Hesperornithes, with the possible exception of Hesperornis regalis, but still much is left to conjecture. The loon-sized bird was of middle size among its relatives and had a markedly elongated neck.
More evidence exists regarding the ecology of B. advenus than any other member of Hesperornithes, with the possible exception of Hesperornis regalis, but still much remains to be speculated upon. The bird-like creature was of average size among its relatives and had a notably long neck.