This model of an adult chicken (*Gallus gallus*) shows the 3D orientations and magnitudes of the different jaw muscles. In the background is a ternary plot that shows these orientations in 2 dimensions. Notice how all of the temporal muscles are very vertically and rostrocaudally oriented. This reflects the pecking and throwing&catch behaviors these birds use when feeding. Featured in Cost et al 2022, JEB). doi: 10.1242/jeb.243216.