


Cik jauki lasīt tādas ziņas

Paldies !Vērotāja wrote:Ir jau bijuši video par Aļaskas zvejas kuģiem un baltgalvas ērgļiem, te vēl viens
While the parasites or bacteria might be health issues in nest abandonment, falling nests and nest trees is obviously impactful, and certainly disturbance is a known factor, I think that the major factor driving nest building in high density eagle habitat is that the activity of building a nest tells other eagles that the territory in occupied and also keeps the builder busy and not attacking an intruder and risking harm. This seems the reasonable conclusion looking at the Chilkat. If you put 4 or 6 nests in a territory, wouldn't that tell a passerby that he would be best to look elsewhere?
What an interesting thesis question! What are the factors driving nesting density and the number of alternative nests per territory? In very food-rich nesting territories AND in areas of high winter and spring populations of visiting eagles, I think there is an extra effort put into new nest building to make a bigger statement to intruders that the territory is occupied -- and at the cost of saving effort and lives.
Šajā video ļoti labi var pavērot zivjērgļu īpatnību - vēlmi celt ligzdu pašā koka spicē, atvērtu vējiem un lietiem, kas mani ikreiz pārsteidz. Laikam daba tā iekārtojusi, jo mazie mācās lidot uzreiz, bez zarošanas perioda pa zariem, bet uzreiz kā helikopterīšiem lidinoties virs ligzdas.
2017. gada 7. jūn.
A baby hawk is being raised by an eagle. There are already 3 eaglets in the nest, appearing huge when compared to their little sibling, probably brought into the nest as a food source and then adopted and raised - comments by eagle biologist David Hancock at the nest.