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Birds Never Get Lost is a collection of Colin Pennycuick’s memoirs that focuses on how he used his flying skills to study flight in birds. Colin, a lifelong pilot and biologist, dedicated his life to learning how birds fly and navigate. He knows how aircraft fly from his training as a pilot, and he uses this knowledge to explain the flight of birds, concentrating on the aerodynamics and navigation of mainly large birds. It all started with his seminal work in the Serengeti during the early 1970s using gliders to follow gliding birds from thermal to thermal. Do not expect to find extensive scientific explanations in this book. Colin’s scientific legacy is accumulated in Modelling the Flying Bird (2008). Here, he translates his experiences in the air into strategies used by birds and refers to his freely available Flight software program (see Pennycuick 2008) that considers the mechanics of avian flight and derives power curves, glide polar curves, and migration simulations from user-entered information. Body mass, speed, lift, drag, and the ratio between the latter two determine the power required to stay airborne and form ‘‘the elementary principles of flight, on which everything in this book is based.’’ There are many back-of-the-envelope calculations, all based on the Flight program, throughout the book. Colin compares his experiences during heroic longdistance solo flights—with only a magnetic compass and a map as navigational aids in small, single-engine aircraft—with what birds must see and endure during their migrations. One of these adventures took him in a Piper Cruiser (a spare fuel tank on the passenger’s seat) from Nairobi to Bristol via Cairo and Crete. Another story is about his solo flight from Miami to Bristol in an elderly Cessna 182. The last leg took him from Søndre Strømfjord across the Greenland ice cap to Iceland, the only stop on the way to England. The idea was to follow the same route taken by satellite-tracked whitefronted geese and to experience the difficulties geese may have during their annual migration along this route. Colin calculates fuel costs for both the Cessna and the geese using Flight, comparing navigational issues and problems like fog and track-keeping between aircraft and bird. Another heroic story told in a highly understated way is about his time spent at Bird Island, South Georgia, in the

the condor

<i>Birds Never Get Lost</i><b>Birds Never Get Lost</b> by Colin Pennycuick and Sandy Pennycuick. 2015. Matador, Leicestershire, UK. 178 pp., 185 color plates, 23 text figures. $10.86 (paperback). ISBN 9781785890482.

Birds Never Get LostBirds Never Get Lost by Colin Pennycuick and Sandy Pennycuick. 2015. Matador, Leicestershire, UK. 178 pp., 185 color plates, 23 text figures. $10.86 (paperback). ISBN 9781785890482.