Australia is issuing warnings about highly pathogenic H5N1 bird flu after the virus is detected in seabirds across two states. The findings highlight that H5N1 can spread among bird populations and may also infect mammals. A veterinary expert warns that backyard poultry, including chickens, could be at risk if they come into contact with infected birds or contaminated materials. The warnings extend beyond farm animals to pets, with cats also identified as a potential concern because the virus can infect mammals in some circumstances. The reports note that H5N1 has the capacity to affect multiple species, and while human infections are not described as the main issue in these accounts, the virus is characterized as capable of occasionally infecting people. Authorities and experts are therefore urging owners to take preventive steps for backyard animals and pets, reflecting the presence of the virus in the local bird population. Overall, the shared message across the outlets is that detection in seabirds increases concern for backyard chickens and cats, prompting public health and animal care guidance.