Singing Higher: o que o canto das aves urbanas realmente indica (B2)
Birds in noisy cities do not simply sing louder. Recordings gathered across eleven European cities show that several species have shifted the pitch of their songs upward, above the low rumble of traffic, and that some now sing earlier, before the morning rush begins. Presented in a headline, this sounds like a comforting story about adaptable wildlife. Researchers are more cautious. A higher song carries less far, which reduces the number of potential mates who hear it, and singing at four in the morning is expensive for an animal that must also feed. Adaptation, in other words, is not the same as thriving; it is the record of a cost being paid. The birds that remain in our cities are the ones able to afford that cost. The others have quietly gone elsewhere.
Fonte: English for ALL (texto original).
Ao afirmar que "Adaptation, in other words, is not the same as thriving", o texto pretende
- A) demonstrar que as aves urbanas se reproduzem mais do que as aves do campo.
- B) sugerir que o ruído do tráfego deixou de afetar as espécies estudadas.
- C) confirmar a leitura otimista sugerida pelas manchetes sobre fauna adaptável.
- D) advertir que as mudanças no canto representam um custo, e não uma prova de sucesso.
- E) explicar por que as aves passaram a cantar em tons mais graves nas cidades.