. Life histories of North American petrels and pelicans and their allies; order Tubinares and order Steganopodes . ter wrens and sooty song spar-rows announced their presence with their clear musical trill. The vocal performances of this species have been referred toabove. They consist of a variety of soft twittering notes, given inflight while flitting about their breeding grounds, or faint squeakingnotes when disturbed in their burrows or Avhen handled. But, beingnocturnal in its activity and being so intimately associated withother species, it is not easy to distinguish its note with certai
. Life histories of North American petrels and pelicans and their allies; order Tubinares and order Steganopodes . ter wrens and sooty song spar-rows announced their presence with their clear musical trill. The vocal performances of this species have been referred toabove. They consist of a variety of soft twittering notes, given inflight while flitting about their breeding grounds, or faint squeakingnotes when disturbed in their burrows or Avhen handled. But, beingnocturnal in its activity and being so intimately associated withother species, it is not easy to distinguish its note with certainty. In its association with other species it is gentle and harmless itself,but it has many enemies. In the Aleutian Islands it falls an easyprey to prowling foxes, which dig out its nesting burrows, killingand eating both old and young; it has been practically exterminatedon the islands where foxes are abundant. The minlv and other pred-atory animals destroy large numbers. On St. Lazaria Island, Doc-tor Grinnell found evidence that crows were also destructive in dig- U. S. NATIONAL MUSEUM BULLETIN 121 PL. 21. Jericho Bay, Maine.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbirdsno, bookyear1922
