Read the Economics of Foraging
Foraging decisions balance energy gain against the time and effort spent locating and exploiting food.
Foraging Strategies is the central idea in this question pattern. Identify the condition in the stem before applying the method below.
Balance costs and gains
The Marginal Value Theorem predicts that a forager should leave a patch when its marginal gain falls relative to the expected gain elsewhere, accounting for travel time and patch quality.
Read the study, not just the theory
In the house-sparrow study, match the chosen interpretation to both plotted measures and the option wording. Urban birds are shown spending less time foraging while the keyed interpretation notes resources at larger distances. This observational pattern supports the selected interpretation but does not establish distance as its cause.
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- ✓Foraging balances patch gain with search and travel costs.
- ✓Check every axis and compare the observed pattern with the answer choices.
- ✓Observational data support interpretations, not causal proof.
Do not assume resources are closer or more abundant unless the figure shows it.
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