By Ernest Preston Edwards
Этот определитель включает детальное описание для легкой идентификации всех мексиканских видов птиц. Описание включает английские, испанские и латинские названия, характеристику ареала, местообитаний, обилия.
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Extra resources for A Field Guide to the Birds of Mexico and Adjacent Areas: Belize, Guatemala and El Salvador
A common error is to have bars that are too wide, as this will affect the bend of your arm and also bring you very far forward on the bike. Some downhill racers use bars up to 780mm wide, but you really have to have the shoulder width to go with them or you will struggle to control your bike. The height at which you have your handlebars is determined by the stack height of your forks and headset; this means the height of your fork steerer-tube plus the headset (the set of bearings by which the forks are allowed to rotate for steering) and can then be fine-tuned by adding or reducing the number of spacers between the stem and headset.
A guide at the top of the chain-ring, and a tensioner at the bottom, ensure the chain does not rattle off the chain-ring. The guide sits close to the top of the chain-ring, which stops the chain jumping or falling off to either side. The tensioner stops the chain moving away from the chain-ring at the bottom and also puts tension on the chain, taking out some of the slack that leads to the chain falling off in the first place. Plastic bash-guards are also commonplace on bikes with a chain device, and these simply attach to the chain-ring, sitting slightly proud around its circumference and ensuring that rocks and other objects cannot bend or damage the chain-ring.
As with helmets, sizing is vital, so make sure that armour fits comfortably and doesn’t move around too much. As a note, it is always a good idea to wear a light base layer underneath your armour to prevent chaffing and to limit odour. Wash armour regularly, as it can quickly pick up a pong. Eye Protection Any conditions when out mountain biking can call for eye protection for a number of preventative reasons: to keep mud, rain, sticks, stones, dust and more out of your eyes; to counteract the effects of sunlight through tinted lenses; and to limit the airflow to your eyes, which can make your eyes water.
A Field Guide to the Birds of Mexico and Adjacent Areas: Belize, Guatemala and El Salvador by Ernest Preston Edwards