If bird nests are decreasing in an area, which investigation is most correct?

Correct answer: Survey breeding sites, tree availability, human disturbance and food sources

A proper investigation must examine all major likely causes of nest decline. Suitable breeding sites and trees are needed for nesting, while human disturbance and reduced food availability can make birds leave an area or breed less successfully. Counting nests alone can confirm the decline, but it cannot identify its cause. Exam tip: For wildlife-decline questions, consider habitat, food, breeding conditions, and human activities together.