Falconry training and technique the jesses lying on the scale can change the reading, so the falconer has to be careful to lift them up while the bird is being weighed. Above that range of weight, the bird will be unresponsive in the field, lacking in motivation to hunt or return to the falconer in timely fashion. Gauntlets or gloves are used by the falconer to turn the arm into a suitable perching surface. Falconry gloves may only cover the fist and wrist, while gauntlets for larger species extend to the elbow. An eagle glove may cover the entire arm and a portion of
The Macmillan Field Guides to Bird Identification geographical area of coverage are included; instead only groups of species which the authors regarded as difficult to identify are covered. Each such group is given a chapter, where identification is covered discurively rather than in the abbreviated form more usually used in a field guide. The publication of the first volume (covering Britain and Ireland) was the first time that this approach had been used in a European guide The first volume is widely credited as having a major influence on improving the identification skills of birders in Britain during the 1990s. The Macmillan Field Guides to Bird Identification