 From the Middle Miocene or Early Pliocene of the Lee Creek Mine, some remains of pseudotooth birds which probably fell victim to sharks while feeding are known.The large members of the abundant Lee Creek Mine shark fauna that hunted near the water's surface included the broadnose sevengill shark ("Notorynchus cepedianus"), "Carcharias" sand tiger sharks, "Isurus" and "Cosmopolitodus" mako sharks, "Carcharodon" white sharks, the snaggletooth shark "Hemipristis serra", tiger sharks ("Galeocerdo"), "Carcharhinus" whaler sharks, the lemon shark ("Negaprion brevirostris") and hammerhead sharks ("Sphyrna"), and perhaps (depending on the bird fossils' age) also "Pristis" sawfishes, "Odontaspis" sand tiger sharks, and "Lamna" and "Parotodus benedeni" mackerel sharks.It is notable that fossils of smaller diving birds – for example auks, loons and cormorants – as well as those of albatrosses are much more commonly found in those shark pellets than pseudotooth birds, supporting the assumption that the latter had quite low population densities and caught much of their food in mid-flight.