دانلود کتاب Bumble Bees of North America: An Identification Guide

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Contents\nIntroduction\nObserving Bumble Bees\nAttracting Bumble Bees\nBumble Bee Forage Guide by Ecoregion\nMaps and Seasonal Activity\nBumble Bee Decline and Conservation\nThreats to Bumble Bees\nNatural Enemies\nMimicry\nDistinguishing Bumble Bees from Other Insects\nBumble Bee Names and Classification\nHow to Use This Book to Identify Bumble Bee Species\nSpecies Accounts\nSquare- or long-cheeked bees with a rounded angle on the midleg\nShort-cheeked bees with a rounded angle on the midleg\nMedium- or long-cheeked bees with a sharp angle on the midleg\nHindleg (tibia) with the outer surface uniformly convex and densely hairy (cuckoo bumble bees, no workers)\nIdentification Keys to Female and Male Bumble Bees, with Photos\nGlossary\nAdditional Resources\nAcknowledgments\nPhoto Credits\nIndex