This Crossbill Guide is a thorough and practical guide for naturalists and nature lovers. It covers southern Portugal north to Lisbon. Within this region it focuses specifically on four particularly wild and beautiful sections:

- The the Lisbon-Setúbal area, with its limestone hills and cliffs, and its large wetlands of the Tejo and Sado estuaries.
- The large, wild and remote southern Alentejo with its steppes and large swathes of montados (dehesas).
- The famous Algarve, which has numerous small but bird-rich wetlands and limestone hills.
- The Costa Vicentina the little visited wild Atlantic coast in the southwest.

The nature travel guidebook to Southern Portugal contains routes and background info on landscape, flora and fauna.

- Landscape history
- Ecosystems
- Geology
- Flora and Fauna
- Where to watch birds
- Finding orchids and other wild flowers
- 23 detailed routes with tips for finding wildlife and 28 site descriptions

Dirk Hilbers (NL, 1976), set up the Crossbill Guides Foundation and travels Europe to research the guidebooks. This is the 24th guide on which he has worked on. As a biologist, when not in the field, Dirk Hilbers is a free-lance writer and lecturer in the field of environmental ethics.

Kees Woutersen (NL, 1956) has lived in Huesca (Spain) for 20 years, working as a nature and bird guide throughout Spain. He runs his own travel company and is author of various books on birds and natural history. This is his 5th Crossbill Guide.