Which of these is NOT mentioned as a way of attracting and catching birds?

* Hướng dẫn giải

Dẫn chứng:   In nations along the Mediterranean, many migratory birds are illegally trapped or shot. In addition to traps, hunters also use electronic calls to catch birds. This tool, which a hunter can operate from a cell phone, mimics bird sounds and is very effective in attracting the animals-so effective that in some countries, bird populations have plummeted. “There are no birds," says one Albanian man. "We walk for hours without seeing any. It's really scary." Some hunters also use nets to capture birds as they fly close to the sea. The nets are high-going from ground level to just over 3 meters (11 feet)- and invisible to the birds, allowing hunters to trap hundreds of birds at a time.