Although Beebe and his team enjoyed rewarding seasons at Rancho Grande in 1945 and 1946, they did not return there in 1947. The reason they gave in their annual report was that the previous two seasons had produced so much material that they needed an additional year to analyze it, but in reality, this was more the result of insufficient funding as well as the unstable state of Venezuelan politics. Beebe returned to Rancho Grande in 1948, where he completed several technical papers about the migration patterns of birds and insects, as well as a comprehensive study of the area's ecology which he coauthored with Jocelyn Crane. Realizing that the area's politics might soon put an end to their research there, in spring of 1948 Jocelyn made a side trip to Trinidad and Tobago in hope of finding a site for a research station where the politics would be more secure. Finally, when the 1948 Venezuelan coup d'état installed Marcos Pérez Jiménez as Venezuela's dictator, Beebe decided that he could no longer continue to work in Venezuela. Beebe described his experiences at Rancho Grande in his 1949 book "High Jungle", which was the last of Beebe's major books.