| 1 | The Significance of Clutch‐size | Ibis | 1947 | 1,628 |
| 2 | THE TIMING OF BIRDS‘ BREEDING SEASONS | Ibis | 1970 | 1,198 |
| 3 | THE IMPORTANCE OF CERTAIN ASSEMBLAGES OF BIRDS AS “INFORMATION‐CENTRES” FOR FOOD‐FINDING | Ibis | 1973 | 855 |
| 4 | THE REGULATION OF NUMBERS OF TROPICAL OCEANIC BIRDS | Ibis | 1963 | 727 |
| 5 | PATTERNS OF GROWTH IN BIRDS | Ibis | 1968 | 677 |
| 6 | DO TROPICAL BIRDS REAR AS MANY YOUNG AS THEY CAN NOURISH ? | Ibis | 1949 | 628 |
| 7 | The recent declines of farmland bird populations in Britain: an appraisal of causal factors and conservation actions | Ibis | 2004 | 612 |
| 8 | Quantitative criteria for species delimitation | Ibis | 2010 | 574 |
| 9 | Assessing the impacts of wind farms on birds | Ibis | 2006 | 557 |
| 10 | THE LEARNING OF SONG PATTERNS BY BIRDS, WITH ESPECIAL REFERENCE TO THE SONG OF THE CHAFFINCH FRINGILLA COELEBS | Ibis | 1958 | 516 |
| 11 | Avian productivity in urban landscapes: a review and meta‐analysis | Ibis | 2009 | 514 |
| 12 | Why de young birds reproduce less well? | Ibis | 1983 | 462 |
| 13 | Applications of stable isotope analyses to avian ecology | Ibis | 2008 | 457 |
| 14 | The impact of climate change on birds | Ibis | 2004 | 450 |
| 15 | ON CLUTCH‐SIZE AND FITNESS | Ibis | 1974 | 447 |
| 16 | EVOLUTIONARY ASPECTS OF FRUIT‐EATING BY BIRDS | Ibis | 1971 | 438 |
| 17 | Adult sex ratios in wild bird populations | Ibis | 2007 | 410 |
| 18 | The decline ofAfro‐Palaearctic migrants and an assessment of potential causes | Ibis | 2014 | 375 |
| 19 | THE BIOLOGICAL SIGNIFICANCE OF THE TERRITORIES OF BIRDS. | Ibis | 1956 | 368 |
| 20 | The contribution of artificial nest experiments to understanding avian reproductive success: a review of methods and conclusions | Ibis | 1996 | 362 |
| 21 | Habitat influences on urban avian assemblages | Ibis | 2009 | 361 |
| 22 | Habitat fragmentation: island v landscape perspectives on bird conservation | Ibis | 1995 | 354 |
| 23 | Population limitation in migrants | Ibis | 2004 | 334 |
| 24 | Tits and their caterpillar food supply | Ibis | 1991 | 331 |
| 25 | THE MECHANICS OF BIRD MIGRATION | Ibis | 1969 | 328 |
| 26 | FLOCKING AND FEEDING IN THE GREAT TIT PARUS MAJOR–AN EXPERIMENTAL STUDY | Ibis | 1972 | 322 |
| 27 | Non‐lethal effects of predation in birds | Ibis | 2008 | 318 |
| 28 | PATTERNS OF GROWTH IN BIRDS. II. GROWTH RATE AND MODE OF DEVELOPMENT | Ibis | 1973 | 311 |
| 29 | Re‐examination of the capital and income dichotomy in breeding birds | Ibis | 1999 | 310 |
| 30 | The effects of habitat structure on predation risk of birds in agricultural landscapes | Ibis | 2004 | 302 |
| 31 | THE LEVEL OF RESERVE PROTEIN AS THE PROXIMATE FACTOR CONTROLLING THE TIMING OF BREEDING AND CLUTCH‐SIZE IN THE RED‐BILLED QUELEA QUELEA QUELEA | Ibis | 1976 | 296 |
| 32 | BODY SIZE, ITS HERITABILITY AND INFLUENCE ON JUVENILE SURVIVAL AMONG GREAT TITS, PARUS MAJOR | Ibis | 1981 | 296 |
| 33 | THE SEASONALITY AND POPULATION DYNAMICS OF EQUATORIAL FOREST BIRDS EST SARAWAK | Ibis | 1972 | 288 |
| 34 | FACTORS GOVERNING FEEDING RATE, FOOD REQUIREMENT AND BROOD SIZE OF NESTLING GREAT TITS PARUS MAJOR | Ibis | 1966 | 286 |
| 35 | Circannual clocks in avian reproduction and migration | Ibis | 1996 | 280 |
| 36 | Sources of variation in haematocrit in birds | Ibis | 2007 | 277 |
| 37 | Weather-related mass-mortality events in migrants | Ibis | 2007 | 271 |
| 38 | Mass changes in migrating birds: the evidence for fat and protein storage re‐examined | Ibis | 1993 | 268 |
| 39 | An updated list and some comments on the occurrence of intraspecific nest parasitism in birds | Ibis | 2001 | 267 |
| 40 | SOARING BEHAVIOUR AND PERFORMANCE OF SOME EAST AFRICAN BIRDS, OBSERVED FROM A MOTOR‐GLIDER | Ibis | 1972 | 267 |
| 41 | Sex ratio variation in birds | Ibis | 1986 | 260 |
| 42 | BREEDING BIOLOGY OF HOUSE MARTINS DELICHON URBICA IN RELATION TO AERIAL INSECT ABUNDANCE | Ibis | 1975 | 257 |
| 43 | Survival of British Sedge Warblers Acrocephalus schoenobaenus in relation to west African rainfall | Ibis | 1991 | 248 |
| 44 | Eggs, egg formation and the timing of breeding | Ibis | 1996 | 242 |
| 45 | Guidelines for assigning species rank† | Ibis | 2002 | 233 |
| 46 | ADAPTATIONS IN THE KITTIWAKE TO CLIFF‐NESTING. | Ibis | 1957 | 231 |
| 47 | THE MOULT OF THE BULLFINCH PYRRHULA PYRRHULA | Ibis | 1966 | 231 |
| 48 | Population trends of widespread woodland birds in Europe | Ibis | 2007 | 229 |
| 49 | TIMING AND SPACING OF BROODS IN THE BLACK‐HEADED GULL LARUS RIDIBUNDUS | Ibis | 1965 | 229 |
| 50 | THE ADAPTIVE RADIATION AND FEEDING ECOLOGY OF SOME BRITISH FINCHES | Ibis | 1967 | 225 |
