ACKNOWLEDGMENT; SUMMARY; ZUSAMMENFASSUNG; TABLE OF CONTENTS; LIST OF TABLES; LIST OF FIGURES; 1 GENERAL INTRODUCTION; 2 STUDY AREA; 3 STRUCTURE AND FLORISTIC COMPOSITION OF SECONDARY VEGETATION IN THE DIENG MOUNTAINS; 4 THE DENSITY AND DIVERSITY OF BIRD POPULATIONS IN DIFFERENT VEGETATION TYPES IN THE DIENG MOUNTAINS; 5 MAMMAL SPECIES RICHNESS AND HABITAT PREFERENCES IN THE DIENG MOUNTAINS; 6 GENERAL CONCLUSION; REFERENCES; Appendix; CURRICULUM VITAE