26 despite all the disturbance we found six purple sandpipers on the sea wall near the outfall. We stayed some distance away watching through scopes and binoculars. A family was walking along the top of the sea wall towards them. As they approached we hurriedly took our last looks before they flew off. But no, the family walked within a yard of the birds and they didn't even look up. I knew they were said to be tame, but this was incredible. This made me want to know more about this strange little wader. The purple sandpiper (Calidris maritima) is a small wader darker and larger than a dunlin. It is a passage migrant and winter visitor usually occurring on coasts between mid-July to November and March to early June. It breeds mainly in the Arctic. In winter it favours rocky or boulder strewn shores and is frequently found around piers, groynes and other masonry constructions such as at Holland Haven. It feeds on small fish, insects, crustacea, molluscs and vegetable matter. And at Holland Haven it can be seen foraging in the seaweed. It can swim on the water if swept off its feet by waves and has been known to land on the water voluntarily. For those of us who like to see new species there can be no easier "tick" than these lovely tame waders. Although they do turn up at several localities in the south of the county including Southend Pier, it appears that Dovercourt and Holland Haven are the best winter sites to guarantee a successful journey. ADRIAN VERNON