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From the following article:

Birds extend their ranges northwards

Chris D. Thomas and Jack J. Lennon

Nature 399, 213(20 May 1999)

doi:10.1038/20335

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Figure 1 - Unfortunately we are unable to provide accessible alternative text for this. If you require assistance to access this image, or to obtain a text description, please contact npg@nature.com

Figure 1

Change in the range margins of bird species (defined as the mean distance northwards of the ten most marginal records in 1988-91 minus the mean of the ten most marginal records in 1968-72; positive values indicate a move northwards, and negative values a move southwards) plotted against changes in status (log10 of the numbers of 100-km2 grid cells occupied in 1988-91 compared with 1968-72).

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