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.
Доп. информация: Файл является рипом с сайта Google Books. Этим определяется отсутствие некоторых страниц (до 20% от общего числа) и невысокое разрешение сканирования (около a hundred dpi). Образцы страниц
Мои раздачи биологических определителей, справочников, учебных пособий и монографийБудьте добры, нажмите на кнопку Сказать "Спасибо"!
Read or Download A Field Guide to Hummingbirds of North America PDF
Best outdoor recreation books
As in any army operation requiring distinct talents, reminiscent of mountain climbing, a few precise apparatus and coaching specific to the venture has to be lined. The Marine Corps has followed this education for this very cause. This education permits Marines at the tying of knots, rope platforms, hiking / descending vertical and close to vertical landscapes - all whereas in a strive against setting.
Unveils the mysteries of chook migration. Ornithologist Paul Kerlinger writes in a fascinating kind for all chook enthusiasts. "An first-class, well known, but authoritative rationalization. " --Library magazine
The better half quantity to Tony Route’s well known "Flyfishing Alaska," this ebook is helping the reader decide on and tie the flies had to take trout, char, and salmon all through Alaska. Tony has selected forty six confirmed flies according to his years of adventure flyfishing Alaska’s rivers, lakes, and saltwater. short tying directions are given for every fly, and the ebook is stuffed with anecdotes and fishing suggestion that make it effortless for the traveling flyfisher to understand which flies to take and the way to fish them.
37 vintage shipwrecks round the united kingdom - with complete historical past, images and representation of every via well known marine artist
- Mayflies, ''top to bottom''
- North to Matsumae : Australian whalers to Japan
- 100 Scotsman Walks: From Hill to Glen and River
- Colorado Flora: Eastern Slope
- Cross-Country Skiing for Everyone
Extra info for A Field Guide to Hummingbirds of North America
Associated with bad weather. • Depicted as a red “L” on weather maps. b. Air from a high-pressure area is basically trying to flow out and equalize its pressure with the surrounding air. Low pressure, on the other hand, is building up vertically by pulling air in from outside itself, which causes atmospheric instability resulting in bad weather. c. On a weather map, these differences in pressure are depicted as isobars. Isobars resemble contour lines and are measured in either millibars or inches of mercury.
Higher levels of energy expenditure will be experienced. 8—Very great difficulty. Increasing amount of intermediate protection is the rule. High physical conditioning, climbing technique, and experience required. 9—Extremely great difficulty. Requires well above average ability and excellent condition. Exposed positions, often combined with small belay points. Passages of the difficult sections can often be accomplished under good conditions. Often combined with aid climbing (A0-A4). 10—Extraordinary difficulty.
The bedding planes (strata) may also be distorted by folding and squeezing. Shale changes to slate or schist, sandstone and conglomerate into quartzite, and limestone to marble. These changes may be minimal, only slightly altering the sediments, or extensive enough to produce gneiss, which is almost indistinguishable from igneous rock. (1) Metamorphic rocks may have not only joints and bedding, but cleavage or foliation, a series of thinly spaced cracks caused by the pressures of folding. Because of this cleavage, lower grades of metamorphic rocks may be completely unsuitable for climbing because the rock is too rotten for safe movement.
A Field Guide to Hummingbirds of North America by Sheri Williamson