When Nat cleans up after the first attack how does he explain the birds behavior?

After the first attack, Nat explains the birds' behavior as a reaction to environmental changes, possibly linked to their breeding cycles or food scarcity. He theorizes that the birds are acting in a coordinated manner, driven by instinct rather than individual aggression. Nat suggests that the unusual behavior might be a response to a perceived threat, indicating a shift in their natural patterns. This reflection highlights his growing understanding of the birds and foreshadows the escalating conflict.