Lin Wen-hung believes that it would be sufficient to take on a student for a summer job, to make a daily estimate of the birds 'numbers on the five or six days when the grey-faced buzzard passes through; this is something anyone could do, it does not require any great talent.
林文宏以為，只要在灰面鷲秋天過境的五、六十天左右，請個工讀生每天去估算，不須什麼高手都能做。