When the H5N1 HPAI virus (orange) affected a flock of crows in a public garden, it caused a mass die-off of crows. An Ezo red fox and a Japanese raccoon dog were also infected by the H5N1 HPAI virus, the former likely by consuming corpses of the crows, and the latter due to close contact with crow corpses (Illustration: Takahiro Hiono).