I think I read somewhere that Hitler was very interested in the ecolohy of the Podicipedidae ….    From Wordnik.com.  [Think Progress » DC Media Scoff At President Obama’s Substantive And Detailed Answer To Health Care Question] Reference

However, they have also been considered related to loons (Gaviidae), grebes (Podicipedidae), or cormorants (Phalacrocoracidae).    From Wordnik.com.  [Penguins] Reference

The Peace-Athabasca Delta is an important area for migrant waterfowl including snow geese Anser caerulescens, white-fronted geese A. albifrons and Canada geese Branta canadensis, whistling swan Cygnus columbianus, diver Gavia spp., all seven species of North American grebe (Podicipedidae) and 25 species of duck (Anatidae).    From Wordnik.com.  [Wood Buffalo National Park, Canada] Reference

(Gaviidae), grebes (Podicipedidae), or cormorants (Phalacrocoracidae).    From Wordnik.com.  [Featured Articles - Encyclopedia of Earth] Reference

Podicipedidae.    From Wordnik.com.  [Bird lists] Reference