Table 3. Corrected distances between avian hepadnaviruses calculated on the region corresponding to group 1 eZHBVs (see Figure 1).

	eZHBVc	eZHBVd	eZHBVe	eZHBVh	eZHBVi	eZHBVf	eZHBVg	Crane	Heron	Ross's Goose	Snow Goose	White Stork
eZHBVd	0.63
eZHBVe	0.55	0.52
eZHBVh	0.28	0.27	0.13
eZHBVi	2.45	2.05	—	1.07
eZHBVf	0.61	0.36	0.21	0.32	2.07
eZHBVg	0.30	0.21	0.23	0.14	—	0.10
Crane	1.04	1.13	1.46	0.57	1.13	0.95	0.62
Heron	1.01	1.42	1.61	0.79	1.89	1.13	0.76	0.42
Ross's goose	1.02	1.30	1.37	0.76	0.95	0.96	0.54	0.18	0.37
Snow goose	1.03	1.16	1.55	0.70	1.00	1.10	0.71	0.17	0.39	0.20
White stork	0.95	1.28	1.69	0.68	1.30	1.00	0.77	0.32	0.20	0.32	0.35
Duck	1.09	1.34	1.11	0.66	1.20	1.07	0.61	0.18	0.40	0.16	0.09	0.32

Distances were calculated using the TPM2uf+G model under maximum likelihood settings (see Materials and Methods) in PAUP [65]. Values in bold correspond to distances between eZHBVs that are larger than 0.7. This distance threshold corresponds to twice the average distance between extant avian hepadnaviruses (2×0.27 = 0.54) plus 0.16, which corresponds to a conservatively high estimate of the distance accumulated at the bird genome rate after integration (see Materials and Methods).