Edge detection in landing budgerigars (Melopsittacus undulatus).

The trained birds' preference for the Dreadnought Grey disc was statistically highly significant (P<0.00005, using the binomial statistics described in “ Methods ”).

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With the Dreadnought Grey disc the value of α was closest to 1.0, and was different from this value at only a marginally significant level, implying that in this condition the birds landed nearly randomly all over the test surface even though this grey disc is (at least for humans) clearly distinguishable from the Kingfisher Blue background ( Figure 3 ).

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