Hi Tweets,

Of interest...

M

>Dear all, the following was skimmed from The BWD Skimmer, a newsletter
>published by the same people that give us the Bird Watcher's Digest:
>
>Barn Owls seem to lead a short life. In an 18-year study in Utah, it was
>found that Barn Owls first bred at a little over one year of age, and on
>average only got one year of breeding. Only 12 % of breeding birds still
>have descendants after four generations. Harsh winters led to a low number
>of second broods in the following year, and killed a lot of birds. Survival
>rate until the first breeding is estimated at 30 %.
>
>News on cats and their effect on bird populations is available on
>http://www.wisc.edu/wildlife/extension/catfly3.htm
>
>Different species of Eider use different feeding strategies: King Eiders
>prefer water that is deeper than ten meters, and the average diving depth is
>given as 20.4 meters. Common Eiders prefer water of less than 10 meters, and
>the average depth was 7.4 meters. Steller's Eiders prefer shallow water and
>surface-feed or tip rather than dive as long as possible.
>
>Details available from me!
>Peter Hirsch
>Vienna
>
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