...ich'l took one of the small mechanical service tunnels back to hisoffice... 
Various 「Astounding Stories, August, 1931」
...All of these tunnels and rooms were made in that way...
Various 「Astounding Stories, August, 1931」
...What a pity they cannot hire moles tomake the tunnels with their strong, flat, spade-like feet...
Neltje Blanchan 「Birds Every Child Should Know」
...No wonderthe birds become attached to the tunnels that have cost so muchlabour...
Neltje Blanchan 「Birds Every Child Should Know」
..."The tunnels are sometimes taken possession of by other bees and wasps...
Alpheus Spring Packard 「Our Common Insects」
...When strength comes, theperfect insect tunnels ahead for a distance of more than four inchesand opens up the exit-passage, which I find choked, not with compactsawdust, but with loose powdery rubbish...
Jean Henri Fabre Alexander Teixeira de Mattos 「The Glow-Worm and Other Beetles」
...You see, John had to dig them up; they like to burrow in the weeds andmud, and some of them even make tunnels of mud in which to protect theirsoft bodies...
Margaret Warner Morley 「The Insect Folk」
...The burrow system, or den, in which spectabilis stores its caches offood materials, has its nest, and remains throughout the hours of daylightis a complicated labyrinth of tunnels...
Charles T. Vorhies and Walter P. Taylor 「Life History of the Kangaroo Rat」
...A series of Thomomys was taken in this area in setsplaced in tunnels found under similar mounds...
Rollin H. Baker 「Two New Moles (Genus Scalopus) from Mexico and Texas」
...How he manages toform tunnels and burrows in lines of such unusual straightness isunknown; he always works in darkness, unless it is that he can see inthe dark...
Royal Dixon 「The Human Side of Animals」
... tunnels withendless passing vehicles! Tubes...
Victor Rousseau 「Astounding Stories of Super-Science January 1930」
...The worm monsters attempted no resistance, but sought only to escapeinto their downward tunnels, and in moments those not caught by therays had vanished in the openings...
Various 「Astounding Stories, April, 1931」
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