...With every foot of new ground he travelled over he forged a chain of sympathy which should hereafter bind the Christian nations in bonds of love and charity to the heathen of the African tropics... 
W.H.G. Kingston 「Great African Travellers」
... However, as the early hours are profitable hours in the tropics, it did not drive me to homicide...
Stewart Edward White 「African Camp Fires」
... At Accra, I received a present of an armadillo, or ant-eater, who is certainly a wonderful animal, and well worth studying, in the tedium of a calm between the tropics...
Horatio Bridge 「Journal of an African Cruiser」
...A similarobservation applies to bats, which are dormant during a northernwinter when insects are rare, but never become torpid in any partof the tropics...
J. Emerson Tennent 「Sketches of the Natural History of Ceylon」
...In the tropics also there aretwo forms, one belonging to the dry season and one to thewet season...
Clarence M. Weed 「Butterflies Worth Knowing」
...Presumably in the tropics this species breeds continuously,one generation following another in regular successionunless interrupted by drought or other naturalphenomena...
Clarence M. Weed 「Butterflies Worth Knowing」
...It also belongsto the tropics, occurring in our extreme Southernstates and ranging occasionally as far north as Nebraska...
Clarence M. Weed 「Butterflies Worth Knowing」
...North America; nests from northern New Englandnorthward (southward in the Alleghanies to North Carolina);winters in the tropics...
Frank M. Chapman 「What Bird is That?」
...Eastern North America; nests from northern NewJersey (locally) and mountains of West Virginia to Canada;winters in the tropics...
Frank M. Chapman 「What Bird is That?」
...Nests from Georgia and Louisiana to Canada; wintersin the tropics...
Frank M. Chapman 「What Bird is That?」
...Nests from northern Georgia and southern Kansas toCanada; winters in the tropics...
Frank M. Chapman 「What Bird is That?」
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