generate questions: It was not until the end of the eighteenth century that migration as an explanation for the winter disappearance of birds from northern climes was accepted. Thomas Bewick's A History of British Birds (Volume 1, 1797) mentions a report from "a very intelligent master of a vessel" who, "between the islands of Minorca and Majorca, saw great numbers of Swallows flying northward", and states the situation in Britain as follows:
When was migration finally accepted? {sep_token} Who wrote A History of British Birds? {sep_token} What year was Thomas Bewick's book published? {sep_token} Where were Swallows seen flying? {sep_token} Which directions were the Swallows flying? {sep_token}