| Extirpated: Species that were present historically, but are now locally extinct. |
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| Federal or State legal status: Species that are federally listed, or have been given state legal status. |
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| Imperiled: Species that the International Union for the Conservation of Nature has ranked as imperiled (G1) or rare (G2). |
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| Declining: Species whose population or habitats show significant decline. |
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| Disjunct: Species with few 'satellite' populations that are separated by large relative distance from larger core populations. |
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| Demographic: Species with low birth rates or high death rates resulting in population decline. |
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| Concentration: Species with small, concentrated populations that are vulnerable to local threats and catastrophic events |
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| Fragmentation: Species where human-created barriers such as highways, railroads, impoundments, dry streams, etc., have resulted in populations that are small and isolated from one another. |
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| Distribution: Species where 70% or more of global population breeds within Arizona even if locally abundant. |
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