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In page Yellow-billed stork:

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This species is evaluated as Least Concern for several reasons. First, population trend appears to be decreasing[1] but this decrease is not believed to rapidly approach thresholds for Vulnerable under the population trend criterion.[1] Its range is also very large and does not approach threshold for Vulnerable under range size criterion.[1] Finally, although there have been no official population size estimates,[2] the population is known to be very large and so does not approach thresholds for Vulnerable under population size criterion.[1]