1. procellariiform seabird large long-winged bird with hooked bill and tubular nostrils that wanders the open seas
  2. Procellariiformes petrels; albatrosses; shearwaters; diving petrels
  3. podicipitiform seabird aquatic birds related to the loons
  4. pelecaniform seabird large fish-eating seabird with four-toed webbed feet
  5. passeriform bird perching birds mostly small and living near the ground with feet having 4 toes arranged to allow for gripping the perch; most are songbirds; hatchlings are helpless
  6. coraciiform bird chiefly short-legged arboreal nonpasserine birds that nest in holes
  7. gaviiform seabird seabirds of the order Gaviiformes
  8. sphenisciform seabird flightless cold-water seabirds: penguins
  9. anseriform bird chiefly web-footed swimming birds
  10. piciform bird any of numerous nonpasserine insectivorous climbing birds usually having strong bills for boring wood
  11. caprimulgiform bird long-winged nonpasserine birds
  12. cuculiform bird birds having zygodactyl feet (except for the touracos)
  13. social reformer a disputant who advocates reform
  14. performance bond a bond given to protect the recipient against loss in case the terms of a contract are not filled; a surety company assumes liability for nonperformance
  15. Procellariidae petrels; fulmars; shearwaters;
  16. Passeriformes largest order of birds comprising about half the known species; rooks; finches; sparrows; tits; warblers; robins; wrens; swallows; etc.; the four suborders are Eurylaimi and Tyranni and Menurae and Oscines or Passeres
  17. columbiform bird a cosmopolitan order of land birds having small heads and short legs with four unwebbed toes
  18. Perciformes one of the largest natural groups of fishes of both marine and fresh water: true perches; basses; tuna
  19. Siluriformes an order of fish belonging to the superorder Malacopterygii including catfishes
  20. apodiform bird nonpasserine bird having long wings and weak feet