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The first legs have modified setae on the inner surface that may aid in holding the prey . Modified webs are often tensed or tugged with the first legs . Land snail taxonomy is based on the soft anatomy , consequently the shell is only of secondary taxonomic importance . These include ongoing behavioral studies involving vocalization and learning in birds , studies of their mating and breeding behavior , and systematics and evolutionary ecology of living birds ; systematics and paleontology of fossil birds and mammals , ecological and biogeographical studies of marine mammals ; biological surveys of California birds and mammals ; cooperative international biodiversity surveys ; and captive breeding and conservation of birds . But these are only the first , localized symptoms . She stated that one of the first projects the task force will work on is the development of governmentwide reporting criteria so that delinquency rates can be more fairly and accurately computed and analyzed . Our audits , those by the inspectors general , and others have consistently disclosed serious weaknesses in agency systems used to account for and manage receivables . The snail may be capable of repairing its damaged shell , but it is likely that malformations can originate . This is the first correlation of paleogeographic and paleoceanographic events between the Arctic and the tropics , and it has important implications for global climate .