{"fact":"The bigger the numbers get, the harder it becomes for crows to tell them apart, similar to how humans struggle more with larger numbers at the same proportional difference.","context":"The numerical size effect is reflected by the finding that, at a given numerical distance, larger numerosities were more difficult to discriminate for the crows than smaller ones, which caused a progressive widening of the performance curves with an increase in sample numerosity.","source":"Helen M. Ditz; Andreas Nieder, Format-dependent and format-independent representation of sequential and simultaneous numerosity in the crow endbrain, 10.1038/s41467-020-14519-2","index":226}