...The inside preparations I could not witness, but day after day, as I passed near, I heard the bird hammering away, evidently beating down obstructions and shaping and enlarging the cavity... 
John Burroughs 「Birds and Bees, Sharp Eyes and, Other Papers」
...Hence the boat-like shape, thesmooth hairless body without projections, which easily squeezes its waypast obstructions...
J. H. Fabre Bernard Miall 「Social Life in the Insect World」
...might lodge against them, and form dangerous obstructions in the way of craft which might be hereafter used on the river...
David Collins 「An Account of the English Colony in New South Wales, Vol. 1」
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