Hugo Weigold developed a funnel-like structure for this task at the Heligoland Observatory. For 10 points each:
[10m] Name this task, after which researchers may use an “ice cream cone” or “photographer’s” grip. Field equipment used for this task includes the bal-chatri and the dho-gazza, a “mist” setup used for larger organisms.
ANSWER: capturing birds [accept any answer that indicates the capture, banding, trapping, or netting of wild birds for research; accept specific birds; prompt on capturing or equivalents alone by asking “of what animals?”; prompt on capturing bats or equivalents by asking “what other animals are those traps used with?”]
[10e] The dho-gazza is a mist net used to capture these large birds, which kill with talons and include hawks and falcons.
ANSWER: raptors [accept birds of prey or predatory birds]
[10h] Pencil and paper may be helpful. Mist nets are used to band birds in the mark and recapture method. According to the Lincoln–Petersen index, [read slowly] if 10 birds are initially marked, 24 birds are captured the second time, and 4 birds overlap between the samples, what is the estimated population size? You have 10 seconds.
ANSWER: 60 (According to the Lincoln–Petersen index, the estimated size of a population N equals (n1*n2) / m2, where n1 and n2 are the number of individuals in the first and second samples, respectively, and m2 is the overlap between the samples. Therefore, N = (10*24) / 4 = 60.)
<KP, Biology>