Articles by Author: Colleen T Downs

Search results for Colleen T Downs

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  1. Ground cavity nest temperatures and their relevance to Blue Swallow <em>Hirundo atrocaerulea</em> conservation

    Ground cavity nest temperatures and their relevance to Blue Swallow <em>Hirundo atrocaerulea</em> conservation

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    Blue Swallows Hirundo atrocaerulea are Critically Endangered within South Africa. They nest in natural underground holes in mist-belt grasslands. Temperature dataloggers were used to record ground cavity nest (Tn) and ambient temperature (Ta) for one artificial and 11 natural Blue...
  2. Development and functional significance of dorsal air bags in nestlings of Monteiro's Hornbill <em>Tockus monteiri</em>

    Development and functional significance of dorsal air bags in nestlings of Monteiro's Hornbill <em>Tockus monteiri</em>

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    This study describes the morphology and investigates the possible function of the air bags found on the nestlings of Monteiro's Hornbill Tockus monteiri. These air bags increased in size with age and mass of the nestling until 14 d of...
  3. Observations of Cape Parrot, <em>Poicephalus robustus</em>, nesting in the wild

    Observations of Cape Parrot, <em>Poicephalus robustus</em>, nesting in the wild

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    Most Cape Parrot, Poicephalus robustus, nests have been recorded in snags (standing dead trees) making monitoring of nest contents and nest activities difficult and dangerous. Here the breeding activity of a Cape Parrot pair in the cavity of a live...
  4. Erratum

    Erratum

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
  5. Fifteen years of annual Cape Parrot <em>Poicephalus robustus</em> censuses: current population trends and conservation contributions

    Fifteen years of annual Cape Parrot <em>Poicephalus robustus</em> censuses: current population trends and conservation contributions

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    The Cape Parrot Poicephalus robustus is endemic to South Africa and numbers have reportedly declined since the early 1900s. It is a forest specialist and food nomadic, moving between patches depending on fruit availability. This makes it difficult to estimate...
  6. Distribution of Lilian's Lovebirds in Malawi

    Distribution of Lilian's Lovebirds in Malawi

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    Lilian's Lovebird Agapornis lilianae is regarded as a mopane Colophospermum mopane woodland specialist. Its global population is sparse and is spread along the Zambezi valley with little known about its current distribution and status. We explored the current distribution of...
  7. Abundance of the endangered Cape parrot, <em>Poicephalus robustus</em>, in South Africa: implications for its survival

    Abundance of the endangered Cape parrot, <em>Poicephalus robustus</em>, in South Africa: implications for its survival

    Item type: Journal Article • Journal: African Zoology
    Factors affecting the decline of the endangered Cape parrot, which is endemic to South Africa, are presented. Its abundance and status were investigated during annual intensive national surveys. The merits of such a census are reported. Presence of birds was...
  8. Basking behaviour in the rock hyrax (<em>Procavia capensis</em>) during winter

    Basking behaviour in the rock hyrax (<em>Procavia capensis</em>) during winter

    Item type: Journal Article • Journal: African Zoology
    Basking is a behaviour frequently observed in the rock hyrax (Procavia capensis) during winter that supposedly plays a significant role in rewarming from nocturnal hypothermia. This behaviour, together with changes in body temperature and changes in black bulb temperatures (Tbb)...