pesinnän
Pesinnän (Finnish for nesting or breeding) refers to the breeding period during which birds build nests, lay eggs, incubate them, and rear the young. In Finnish natural history, pesinnän concept covers both the seasonal timing and the behaviors connected to reproduction, and is commonly described as consisting of nest construction, egg-laying, incubation (haudonta), and fledging.
Nest site selection and construction: Birds choose sites based on safety, food availability, and microclimate. Nests
Reproduction and parental care: Egg-laying occurs over a period of days, with incubation lasting from roughly
Ecological context and variation: Pesinnän timing is sensitive to climate and resource cycles. Warmer springs can
Research and conservation: Monitoring nesting phenology and success provides insights into population health and ecosystem change.