Field Guide to Animal Tracks and Scat of California. Lawrence Mark Elbroch

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СКАЧАТЬ ruler is a wonderful tool to help you build confidence in your perceptive and intuitive skills. Track and trail measurements aid in identification and are critical for scientific documentation of species in your area; when you are documenting a rare or potentially controversial species, always take measurements and include a ruler or other scale in photographs. Measurements can also be shared in research and used as a means with which to compare species characteristics. Tape measures, however, if relied upon for too long to aid you in species identification, will likely become a hindrance to further developing your perceptive and intuitive skills. For instance, the registration of toe 1 in the front tracks of the Douglas's Squirrel is a less ambiguous, and therefore more useful, means with which to differentiate their tracks from those of other tree squirrels. Learn to look for and appreciate the details.

      Measuring Tracks

      Here track parameters include nails and posterior pads. Some trackers do not include the nails; however, certain mammal species, including porcupines and pocket mice, rarely register digital pads, and thus measurements would be impossible without them. Also, be cautious to avoid measuring drag marks or the impressions made by feet as they enter and leave a particular substrate; measure the floor of the actual track and not the walls.

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