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Daily food consumption of the Red-backed Shrike averaged 56% of the mean body weight for nestlings and 50% for fledglings Gross energy intake was 15.9 kcall/ nestling/ day, and 22.8 kcal/ fledgling/ day. Average daily metabolic rate was 8.4 kcal/nestling/day and 14.9 kcal/ fledgling/day. Food consumption and metabolic rate were largely affected by the ambient temperature. Amount of food consumed by young birds until a month of age in the Red-backed Shrike population was 3.5 mg fresh weight of insects per day per m2.
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Operational Program Digital Poland, 2014-2020, Measure 2.3: Digital accessibility and usefulness of public sector information; funds from the European Regional Development Fund and national co-financing from the state budget.