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pop-hole
pop-hole n.
Brit. 
/ˈpɒphəʊl/
, /ˈpɒphəʊl/U.S. /ˈpɑpˌhoʊl/
a hole in a hedge, fence, etc., through which animals can pass; a small doorway in a unit housing chickens or other domestic animals./ˈpɑpˌhoʊl/ΘΚΠ
the world > animals > by habitat > habitat > [noun] > gap through which animal passes
meuse1523
creeper1845
creep1875
pop-hole1878
1878 R. Jefferies Gamekeeper at Home vi. 116 ‘Blind’ holes and ‘pop’ holes (i.e. those which end in undisturbed soil, and those which are simply bored from one side of the bank to the other, being used only for temporary concealment).
1941 E. B. White in Harper's Mag. Aug. 332/2 In the brooder house the young cockerels were assembling in a corner, so I took a bamboo pole and rattled it and they quickly found the roosts. Then I closed the pophole.
1944 Living off Land: Man. Bushcraft ii. 30 Kangaroos, often hard to shoot, are fairly easy to snare in country where there are netting fences, as often their pads run alongside the fence to a spot where they either jump it or crawl through a ‘pop-hole’.
1992 Times 11 Feb. 3/2 If birds are outside, they will all rush for the hen house and some get crushed to death as they try to squeeze through the popholes.
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