Vertebrate animals |
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animals apparatus appears armed arranged arteries base beak become belong beneath birds blood body bones branches branchiæ canal carried cavity characterised characters closed colour common composed considerable covered differ directed distinguished divided edge eggs entirely Europe external extremities eyes feathers feed feet fins fishes five flesh foot four front functions furnished genera genus give habits hair head heart horns inhabits interior kind known length less live lower lungs mantle membrane middle mollusks mouth muscles nails nature nearly neck nerves organs pass placed Plate possess prey principal produced properly so called remarkable reptiles resemble round seen sense separated serve shell short side single situate skin sometimes sort species strong structure surface tail teeth thick toes trees tribe upper vessels whole wings young