What have these got in common?

3 Red-rumped Swallows

1st summer Purple Heron

2 Bee-eaters

White-tailed Eagle

Collared Pratincole

2 male Blue-headed Wagtails

and thousands of migrant birds of many species

Answer: They were all visible from the Spurn migration watchpoint at the Warren,  just in April 2011. Thanks to Rich S. and co. a favourite little corner of mine (and others) has received an upgrade. Designed to protect from certain wind directions as well as a place to seat flasks and cameras. What will be the next headlining fly-by?

Being built and next day getting first testing by Spurn regulars