An experimental test of the function of sticks in the nests of House Wrens

Article Abstract:

An experimental test to study the function of sticks in the nests of House Wrens reveals that the removal of sticks from nests has only a minor effect on the pair-bond formation, nesting stage duration and number of eggs laid. These findings indicate that the filling up of the nest boxes with sticks by the male house wrens is not a prerequisite for attracting females or for rearing the young ones. Also, stick removal fails to affect the ability and time taken by females to build a soft portion in the nest.

Analysis, Nest building

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Skeletal development at the time of fledging in house wrens

Article Abstract:

The bone maturity of fledging house wrens, Troglodytes aedon, was examined to determine the effect of calcium availability on the growth of this bird species. Results reveal that the bones of fledging contain 30% less calcium than those of adults. There is significant variability in bone mineralization among different body regions. The implications of these variation in bone mineralization are discussed.

Research, Bones, Physiological aspects, Bone density, Calcium in the body, Calcium (Nutrient), Birds, Nestlings, Skeletal maturity

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