Download A Field Guide to Hummingbirds of North America by Sheri Williamson PDF

By Sheri Williamson

Это наиболее детальный определитель колибри, характеризующий 31 североамериканский вид и снабженный 250 цветными фотографиями и 33 картами. Во вводной главе изложена естественная история колибри, способы их привлечения и кормления, а также места в США и Канаде, наиболее удобные для наблюдения колибри. На 31 цветной вкладке приведены иллюстрации 28 видов, 7 гибридных комбинаций, three формы альбиносов и four вида бабочек-бражников, часто принимаемых за колибри. Описание видов включает информацию о песнях и сигналах, шорохе крыльев, сходных видах, поведении, местообитаниях, распространении, систематике, охранном статусе. Для некоторых распространенных мигрирующих видов приведены даты ожидаемого весеннего прилета.
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Extra resources for A Field Guide to Hummingbirds of North America

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Its strength is cutting along the edge rather than thrusting. This makes it an excellent choice for the draw cut, slice, or slash. This type of knife is not illegal to own, but it could prejudice a jury as easily as it could scare off an attacker. The Bowie knife was designed to be equally effective for the thrust and the slash but it can easily do the work of a camp/trail knife. It could be described as a heavy blade with much of its edge parallel to its spine after which it scallops downward in a long arc.

The antlers of stag, most notably Sambar stag, are often coveted for their rustic look and durability. Jigging is the practice of notching a pattern into the handle material for the purpose of decoration or to enhance grip. Jigging can be used to produce a regular geometric pattern, such as a grid or a more abstract decoration. The jigging shown on this F&W Sowbelly from Queen Cutlery is a worm groove pattern in bone. Photo courtesy of Queen Cutlery. Antler material, such as the stag handle on this Case Deer Hunter, remains as popular as it is traditional.

The liner lock was a great advancement in knife lock technology and hastened the evolution of the tactical knife. Knives that can be opened and closed with one hand are favored by tactical operators and rescue personnel because they may not have a second hand to spare in hand-to-hand combat or while applying pressure to a wound. A knife in the hand opposite one's holster can also be vital in preventing a gun takeaway. The strength of the liner lock is largely dependent on the quality if not the strength of the individual components.

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