I don't agree with the culling of the birds for the following reason:

If there is a case of the bird flu, what they should do is keep all of the possible carriers contained in a quaranteen area. All the survivng birds would have some sort of resistance to the flu, and therefore should be allowed to populate. The chances that at least 1 of the birds is resistant is high. However, if they do die, then they were going to anyway.

The major problem with large scale culling, is that the animals with resistance to the disease do not get a chance to breed, thus we get generations of immunity weakend animals, including humans.

Strains of viruses often change and adapt, and some can be dormant or thought to be extinct, then up comes a strain again.

Culling leads to weaker animals in the long term and what good would that do?