Cases in which birds cooperate to capture prey are rare. The classical example is that of the extinct New Zealand Huia (Heteralocha acutirostrisl, in which the chisel-like beak of the male was used to expose grubs which were extracted by the thinner curved beak of the female (Soper 1972).
Author: George W. Folks
Volume Number: 42 Year Published: 1995
Issue Number: 1
Page Number: 5
Link to article: http://birdlife.aosbirds.org/1995/Vol 42 No. 1_1995_p5-9.pdf
Link to the full issue of BirdLife: http://birdlife.aosbirds.org/1995/Vol 42 No. 1_1995.pdf