National Geographic : 1932 May
THE NATIONAL GEOGRAPHIC MAGAZINE DISKED TOES GIVE A SURE FOOTHOLD EVERYWHERE The common tree-toad or rain-toad, fyla versicolor, [upper left] is shown here away from his natural environment in order to contrast him with his large tropical cousins, fHyla sepeentrionalis, hailing from Cuba. Metachrosis, or color change, takes place in these as in most other tree-toads. A single individual will turn from dark brown to pale yellow in a few minutes, the change depend ing largely on atmospheric conditions, especially humidity. THESE ARE GIANTS IN THE TOAD FAMILY Bufo marinus, the marine toad from tropical America, is not sea-going, as its name suggests. It is distributed over an exceedingly wide territory, however, and seems to thrive when introduced into regions where it was not previously found. In this way several of the islands of the West Indies have been populated by it, where it was brought to aid in eradicating insects harmful to agriculture.