Larger birds present decreased flight habits due to avian BV/TV allometry. The use of allometry is widespread in forestry and forest ecology. His dissertation subject was the allometry of giant flightless birds. Workers may vary just in size (monomorphism) or size and bodily proportions (allometry). Allometry often studies shape differences in terms of ratios of the objects' dimensions. If the expected slope is outside the confidence intervals, then there is allometry present. Allometry studies the relative size of organs or parts of organisms. Allometry is the analysis of shape based on the biological parameters of growth and size. Allometry refers to the non-linear scaling factor of one variable with respect to another.