Embryonic growth of mallard and Pekin ducks.
D000818:Animals; D001502:Beak / Q000196:embryology; D001835:Body Weight; D004372:Ducks / Q000196:embryology*; D007866:Leg / Q000196:embryology; D008433:Mathematics; D008722:Methods; D014034:Toes / Q000196:embryology; D014921:Wings, Animal / Q000196:embryology