血燕是什么? 可怕吗?

看看血燕是如何形成的

网上有线索探寻血燕的来源

"Iron Oxide On Wooden Plate !!!‏
From: duck-egg-swiftlet-special@googlegroups.com on behalf of harryswiftletfarming (ismailblsb@gmail.com)
Sent: Saturday, 9 May, 2009 4: 21 AM
To: Duck Egg Swiftlet Special (duck-egg-swiftlet-special@googlegroups.com)

While preparing the rusty iron plates, there were lots of rustymaterials on the plastic layer on the floor. What come to my mind was to take those iron oxide and apply to thesurface (one side) wood piece (5"x1"X1/2"). What I did was to nail or screw the cover wood onto the nestingplanks. I am not very sure of the result but hopefully the birds will likesthem. --~--~---------~--~----~------------~-------~--~----~You received this message because you are subscribed to the Google Groups "Duck Egg Swiftlet Special" group.To post to this group, send email to duck-egg-swiftlet-special@googlegroups.comTo unsubscribe from this group, send email to duck-egg-swiftlet-special+unsubscribe@googlegroups.comFor more options, visit this group at http://groups.google.com/group/duck-egg-swiftlet-special?hl=en"