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#30DaysWild, 30 Days Wild, birding, birdwatching, British birds, House martin, mud nest, nest made of mud
Not only are House martins amazingly acrobatic fliers, they also have incredible construction skills.
Imagine building a mud house, seemingly with no support at all, at the very top of a four-storey building, out of tiny balls of mud you carry in your mouth from a nearby beach or river bank.
Imagine, too, the skill it takes to successfully fly in and land on the edge of the tiny gap in that mud house so as to feed your ever-hungry chicks. On day 29 of #30DaysWild, and every other day, House martins have my respect and admiration!
earthstar 
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