Study

Adoption of a juvenile by breeding Spanish imperial eagles during the postfledging period

  • Published source details Gonzalez J.L., Heredia B., González L.M. & Alonso N. (1986) Adoption of a juvenile by breeding Spanish imperial eagles during the postfledging period. Raptor Research, 20, 77-78.

Actions

This study is summarised as evidence for the following.

Action Category

Foster eggs or chicks of raptors with wild conspecifics

Action Link
Bird Conservation

Artificially incubate and hand-rear raptors in captivity

Action Link
Bird Conservation
  1. Foster eggs or chicks of raptors with wild conspecifics

    A small study in wetlands in the Doñana National Park, southern Spain, in summer 1984 (Gonzales et al. 1986), found that an orphaned fledgling Spanish imperial eagle Aquila adalberti was successfully supported by foster parents. The orphan was found after leaving the nest (aged approximately 91 days) and initially taken into captivity before being released, with some supplementary food, into the home range of a family with two young of approximately the same age (which had left the nest but which were still dependent on parental feeding). All young were fed and chased by parents at approximately the same frequency, suggesting the foster fledgling had been accepted. This study also discusses other interventions, in ‘Add perches to electricity pylons to reduce electrocution’, ‘Bury or isolate power lines’, ‘Use signs and access restrictions to reduce disturbance at nest sites’ and ‘Remove/treat endoparasites’.

     

  2. Artificially incubate and hand-rear raptors in captivity

    A small study in wetlands in the Doñana National Park, southern Spain, in summer 1984 (Gonzalez et al. 1986), found that an orphaned fledgling Spanish imperial eagle Aquila adalberti (91 days old) increased in weight by 1,250 g in nine days in captivity (growing from 2,300 g to 3,550 g). The chick was then successfully released and ‘adopted’ by a foster pair, discussed in ‘Foster eggs or chicks with wild conspecifics’.

     

Output references
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