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SOCIAL ORGANIZATION IN RUDDY AND MACCOA DUCK.SIEGFRIED WR.1976; ; AUK; U.S.A.; DA. 1976; VOL. 93; NO 3; PP. 560-570; BIBL. 1 P. 1/2Article

SEGREGATION IN FEEDING BEHAVIOUR OF FOUR DIVING DUCKS IN SOUTHERN MANITOBASIEGFRIED WR.1976; CANAD. J. ZOOL.; CANADA; DA. 1976; VOL. 54; NO 5; PP. 730-736; ABS. FR.; BIBL. 22 REF.Article

SEX RATIO IN THE CAPE SHELDUCK.SIEGFRIED WR.1976; OSTRICH; S. AFR.; DA. 1976; VOL. 47; NO 2-3; PP. 113-116; BIBL. 16 REF.Article

TROPHIC STRUCTURE OF SOME COMMUNITIES OF FYNBOS BIRDSSIEGFRIED WR.1983; JOURNAL OF SOUTH AFRICAN BOTANY; ISSN 0022-4618; ZAF; DA. 1983; VOL. 49; NO 1; PP. 1-43; ABS. DUT; BIBL. 2 P.Article

BREEDING BIOLOGY AND PARASITISM IN THE RUDDY DUCK.SIEGFRIED WR.1976; WILSON BULL.; U.S.A.; DA. 1976; VOL. 88; NO 4; PP. 566-574; BIBL. 13 REF.Article

TIME BUDGET OF BEHAVIOR AMONG LESSER SCAUPS ON DELTA MARSH = DEROULEMENT DANS LE TEMPS DES ACTIVITES DE L'ANATIDE AYTHYA AFFINIS DU DELTA MARSH, MANITOBASIEGFRIED WR.1974; J. WILDLIFE MANAG.; U.S.A.; DA. 1974; VOL. 38; NO 4; PP. 708-713; BIBL. 12REFArticle

DISPLAYS OF THE JACKASS PENGUINEGGLETON P; SIEGFRIED WR.1979; OSTRICH; ZAF; DA. 1979; VOL. 50; NO 3; PP. 139-167; BIBL. 33 REF.Article

BEHAVIOURAL RESPONSES OF YOUNG CAPE GANNETS SALA CAPENSIS TO HIGH AMBIENT TEMPERATURES. = REPONSES COMPORTEMENTALES DE JEUNES S.C. A DES HAUTES TEMPERATURES AMBIANTESCOOPER J; SIEGFRIED WR.1976; MAR. BEHAV. PHYSIOL.; G.B.; DA. 1976; VOL. 3; NO 4; PP. 211-220; BIBL. 14 REF.Article

FLOCKING AS AN ANTI-PREDATOR STRATEGY IN DOYES. = LE RASSEMBLEMENT DES COLOMBES EN TANT QUE MANOEUVRE ANTI-PREDATEURSIEGFRIED WR; UNDERHILL LG.1975; ANIMAL BEHAV.; G.B.; DA. 1975; VOL. 23; NO 3; PP. 504-508; BIBL. 9 REF.Article

ABOVE-GROUND BIOMASS OF AUSTRALIAN ACACIAS IN THE SOUTHERN CAPE, SOUTH AFRICAMILTON SJ; SIEGFRIED WR.1981; J. S. AFR. BOT.; ISSN 0022-4618; ZAF; DA. 1981; VOL. 47; NO 4; PP. 701-716; ABS. AFR; BIBL. 18 REF.Article

FORAGING RANGES OF KRILL-EATING PENGUINSWILLIAMS AJ; SIEGFRIED WR.1980; POLAR REC.; GBR; DA. 1980; VOL. 20; NO 125; PP. 159-162; BIBL. 31 REF.Article

THE COOLING RATE OF EGGS OF MOORHEN GALLINULA CHLOROPUS IN SINGLE AND MULTI-EGG CLUTCHES.FROST PGH; SIEGFRIED WR.1977; IBIS; G.B.; DA. 1977; VOL. 119; NO 1; PP. 77-80; BIBL. 6 REF.Article

CONTINUOUS BREEDING AND ASSOCIATED BEHAVIOUR IN THE MOORHEN GALLINULA CHLOROPUSSIEGFRIED WR; FROST PGH.1975; IBIS; G.B.; DA. 1975; VOL. 117; NO 1; PP. 102-109; BIBL. 1/2PArticle

INTER-RELATIONSHIPS BETWEEN TYPE, SIZE AND COLOUR OF FRUITS AND DISPERSAL IN SOUTHERN AFRICAN TREESKNIGHT RS; SIEGFRIED WR.1983; OECOLOGIA; ISSN 0029-8549; DEU; DA. 1983; VOL. 56; NO 2-3; PP. 405-412; BIBL. 38 REF.Article

EGG COMPOSITION AND HATCHLING PRECOCITY IN SEABIRDSWILLIAMS AJ; SIEGFRIED WR; COOPER J et al.1982; IBIS; ISSN 0019-1019; GBR; DA. 1982; VOL. 124; NO 4; PP. 456-470; BIBL. 2 P.Article

SOME PHYSIOLOGICAL AND BIOCHEMICAL ADAPTATIONS TO DURING IN THREE SPECIES OF DUCKS.COOK PA; SIEGFRIED WR; FROST PGH et al.1977; COMP. BIOCHEM. PHYSIOL., A; G.B.; DA. 1977; VOL. 57; NO 2; PP. 227-228; BIBL. 6 REF.Article

CONSERVATION OF THE JACKASS PENGUIN (SPHENISCUS DEMERSUS (L.))FROST PGH; SIEGFRIED WR; COOPER J et al.1976; BIOL. CONSERV.; NETHERL.; DA. 1976; VOL. 9; NO 2; PP. 79-99; BIBL. 1 P. 1/2Article

ARTERIO-VENOUS HEAT EXCHANGE SYSTEMS IN THE JACKASS PENGUIN SPHENISCUS DEMERSUSFROST PGH; SIEGFRIED WR; GREENWOOD PJ et al.1975; J. ZOOL.; G.B.; DA. 1975; VOL. 175; NO 2; PP. 231-241; BIBL. 21REFArticle

A DESCRIPTION AND INVENTORY OF THE DISPLAYS OF THE MACCOA DUCK OXYURA MACCOA. = DESCRIPTION ET INVENTAIRE DES DEMONSTRATIONS ET POSTURES PROPRES AU CANARD MACCOA O.MSIEGFRIED WR; VAN DER MERWE FJ.1975; Z. TIERPSYCHOL.; DTSCH.; DA. 1975; VOL. 37; NO 1; PP. 1-23; ABS. ALLEM.; BIBL. 1/2 P.Article

ACTIVITY PATTERNS IN A POPULATION OF FREE-RANGING WILDEBEEST CONNOCHAETES TAURINUS AT ETOSHA NATIONAL PARKBERRY HH; SIEGFRIED WR; CROWE TM et al.1982; Z. TIERPSYCHOL.; ISSN 0044-3573; DEU; DA. 1982; VOL. 59; NO 3; PP. 229-246; ABS. GER; BIBL. 8 REF.Article

DISPERSAL OF ACACIA CYCLOPS BY BIRDSGLYPHIS JP; MILTON SJ; SIEGFRIED WR et al.1981; OECOLOGIA; ISSN 0029-8549; DEU; DA. 1981; VOL. 48; NO 1; PP. 138-141; BIBL. 34 REF.Article

BEHAVIOURAL ADAPTATIONS OF THE JACKASS PENGUIN SPHENISCUS DEMERSUS TO A HOT, ARID ENVIRONMENT.FROST PGH; SIEGFRIED WR; BURGER AE et al.1976; J. ZOOL.; G.B.; DA. 1976; VOL. 179; NO 2; PP. 165-187; BIBL. 23 REF.Article

DISTRIBUTION AND SPECIES RICHNESS OF TREES IN SOUTHERN AFRICAKNIGHT RS; CROWE TM; SIEGFRIED WR et al.1982; J. S. AFR. BOT.; ISSN 0022-4618; ZAF; DA. 1982; VOL. 48; NO 4; PP. 455-480; ABS. AFR; BIBL. 2 P.Article

ENERGY REQUIREMENTS FOR BREEDING IN THE MACCOA DUCK.SIEGFRIED WR; BURGER AE; FROST PGH et al.1976; ARDEA; NETHERL.; DA. 1976; VOL. 64; NO 3-4; PP. 171-191; BIBL. 1 P. 1/2Article

A SIMULATION MODEL FOR THE POPULATION DYNAMICS OF THE JACKASS PENGUIN.JACKSON F; SIEGFRIED WR; COOPER J et al.1976; TRANS. R. SOC. S. AFR.; S. AFR.; DA. 1976; VOL. 42; NO 1; PP. 11-21; BIBL. 13 REF.Article

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