Part 4 · Bird Surveying Techniques
Questions 31–40
Complete the notes below. Write ONE WORD for each answer.
Bird surveying techniques
The study by Cunningham in 1995
• It aimed to study birds which were 31 in cities.
Methodology
• Researchers were able to 32 rather than count the number of birds by some methods, such as random sampling.
• Using a 33 system to study birds' companionship habits.
• Research attached tags to birds' legs to decide the 34 over time.
Findings
• Birds tended to choose the same nesting site in which they were raised.
• Human activities, e.g. 35 , can be a disadvantage to bird reproduction.
Measures taken by local organisation:
• To increase birds' rate of 36 in various ways.
• To reduce the dangers caused by 37 farms, e.g. colliding with turbines.
The study by Conway in 2006
• Researchers monitored the 38 of birds' nocturnal callings during flight.
• 39 were taken to listen to birds' sounds.
• Data could be collected through noise detection devices placed at a great 40 .