It is true. I posted a link a few pages back where it wasn’t just waterfowl that had the flu. It had spread to a variety of crow, starlings, doves and pigeons, hawks and owls. If that isn’t possible why lockdown in the UK? Surely not every bird there is strictly waterfowl that flies all over the country?That is just not true - it's like saying a disease suffered by one mammal can be spread by any other. The lists of wild birds found with the disease show clearly which species are at risk, and they are updated weekly in the UK. Have a look if you want to see the data
https://www.gov.uk/government/publications/avian-influenza-in-wild-birds