Breeding biology of the Corvidae

Holyoak, David T.

doi:10.1080/00063656709476159

Cited by 42 publications

(36 citation statements)

References 15 publications

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“…comm.). Holyoak (1967) found that the majority of Jackdaw nests were in cavities and success was very low where open sites were used. Hence a loss of elm cavities through felling might lead to reduced breeding success in the future.…”

Section: Jackdaw Corvus Monedulamentioning

confidence: 99%

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Some effects of Dutch elm disease on nesting farmland birds

Osborne¹

1982

Bird Study

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Section: Jackdaw Corvus Monedulamentioning

confidence: 99%

“…1974). 'he increasing habit of nesting on pylons, mentioned by Holyoak (1967) and Sage and Vernon (1978), might be connected with DED and would repay further study (Hayman 1981). Sage and Vernon (1978) listed the percentage of Rook nests in elms in various counties in England.…”

Section: Rook Corvus Frugilegusmentioning

confidence: 99%

Some effects of Dutch elm disease on nesting farmland birds

Osborne¹

1982

Bird Study

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“…Incubation probably starts early in the laying period at most nests, although from the varying stages of development within some broods of young, this would seem to vary. As mentioned previously (Holyoak 1967b) there are some records suggesting that Choughs lay one egg per day, and others suggesting they lay at two-or three-day intervals; the problem remains unresolved.…”

Section: Nestsmentioning

confidence: 96%

“…Details of laying dates, clutch sizes and brood sizes of Choughs in Britain are given by Rolfe (1966) and Holyoak (1967b), so this account is limited to observations on nest building and behaviour at the nest not discussed in those papers. Most of the Chough nest sites were on ledges in dark sea caves, ledges in mine shafts, ledges in disused buildings, or in wide-entranced holes in crags and sea cliffs.…”

Section: Nestsmentioning

confidence: 99%

Behaviour and Ecology of the Chough and the Alpine Chough

Holyoak¹

1972

Bird Study

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“…In the UK and Ireland, they lay their first eggs from 19 February to 8 March (Holyoak 1967, Allin 1968, Elliott & Nuttall 1983, Dare 1986, Davis & Davis 1986, in the first half of March in France (Géroudet 1980), and between 15 March and 31 April on the Iberian Peninsula (Lopez del Pozo ex verb. ).…”

Section: Early Breedingmentioning

confidence: 99%

Interesting breeding cases of the Raven (Corvus corax) in Hungary

Bagyura¹,

Fidlóczky²,

Schwartz³

et al. 2017

Ornis Hungarica

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Due to conservation measures, the breeding population of the Raven significantly strengthened over the last decades in Hungary, also nesting on the lowlands. Nowadays, observing large flocks is not rare. Compared to other European countries, the urbanization of the species began relatively late in Hungary, in the '90s, first breeding in the urban areas of Baranya County. There were another five similar known cases after the millennium across the country. Because of the advanced adaptive capacity of species, this number is likely to grow in the future.In Hungary, the brood is typically complete in the second half of February and the young birds fledge in the first days of May. There are two known cases after the millennium when the Ravens bred in a significantly different time than usual. In these cases, the young birds fledged on 20 January and the second half of February. In both cases, the nests were found on overhead transmission line poles in lowland agricultural areas. It is uncertain what led to the unusual breeding time, but it is most likely that the breeding pair was accustomed, having successfully raised several brood before, and they could rely on the abundant food base near the nests during the breeding period.Keywords: Raven, early breeding, urbanization Összefoglalás Magyarországon a holló költőállománya az utóbbi évtizedekben -a természetvédelmi intézkedé-seknek köszönhetően -jelentősen megerősödött, és a faj síkvidéken is megjelent, mint fészkelő. Manapság a nagyobb csapatok megfigyelése sem ritka. Más európai országokhoz képest Magyarországon viszonylag későn, a '90-es években kezdődött el urbanizálódása, elsőként Baranya-megyében költött belterületen. Az ezredfordulót követően országszerte további öt hasonló esetről tudunk. A faj fejlett adaptációs képessége miatt ez a szám a jö-vőben vélhetően növekedni fog.Magyarországon a párok fészekalja általában február második felében már teljes, és a fiatalok május első napjaiban repülnek ki. Az ezredfordulót követőn két olyan esetet ismerünk, amikor a hollók a megszokottól jelentő-sen eltérő időpontban költöttek. Ezeknél a költéseknél a fiatalok január 20-án, illetve február második felében repültek ki. A fészkek mindkét esetben síkvidéki mezőgazdasági területen, távvezeték-tartóoszlopon voltak. Nem lehet pontosan megállapítani, hogy a szokatlan időpontban történő költésekhez konkrétan milyen okok vezettek, de valószínű, hogy a madarak egyrészt már több fészekaljat sikeresen felnevelő, összeszokott költőpárok voltak, másrészt bőséges táplálékbázisra támaszkodhattak a fészkek közelében a költések ideje alatt.

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Breeding biology of the Corvidae

Cited by 42 publications

References 15 publications

Some effects of Dutch elm disease on nesting farmland birds

Some effects of Dutch elm disease on nesting farmland birds

Behaviour and Ecology of the Chough and the Alpine Chough

Interesting breeding cases of the Raven (Corvus corax) in Hungary

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