We heard a lot more birds, but, as someone remarked, they haven't survived for millions of years without being a bit canny and hiding themselves.
We have duly sent off our report to the RSPB. As well as a schools birdwatch initiative, there is also one for gardens.
By the way, there must be something remarkable about seeing three black-headed gulls over 90 miles from the nearest coastline. My memory may be failing, but 30 years ago I thought you hardly ever saw them inland. Someone said I was "cheating" by counting birds flying overhead. I see. That's cheating is it? Like birds hardly ever fly overhead do they?