From Pekingese to St. Bernard and greyhound, dogs come in such startling variety it's easy to forget they belong to the same species. The profusion of breeds today -- at least 150 -- reflects ...
Animal tracking studies for ecology and conservation all face technological limitations such as high costs or the need for tags to remain in close proximity to detectors. In research published in ...
In the 1970s, after household telephones had become widespread in the U.S., survey operators adopted a random-sampling method called random digit dialing, in which the survey’s designers would choose ...