Re: birding-aus Welcome Swallows

[Chris Shinton <>]

sonnenburg wrote:
> 
> It was very interesting to hear how these clever little blighters
> (Hirundo neoxena) have learned to open doors by activating sensors.
> Obviously it is hard to keep them out if they want in.

Their arial capability is also astounding, as I witnessed at a
manufacturing plant in the Southern Highlands. The birds were nesting
inside a building which had closed doors. There was a D shaped hand hole
in the door, with the straight part horizontal, about 150 mm long by 80
mm high. The birds were flying through the hole at full speed. Amazing.

Chris Shinton


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