> On 14 Feb 2018, at 15:00, David Kastrup <d...@gnu.org> wrote:
> Hans Åberg <haber...@telia.com> writes:
>> On 14 Feb 2018, at 11:34, David Kastrup <d...@gnu.org> wrote:
>>> The mice were running around openly and rather visibly before that.
>>> Already when the cats were confined to one stable cell, the difference
>>> was staggering.  When they roamed freely, it was overwhelming.  They
>>> couldn't have caught hundreds of mice in that time frame: it's just that
>>> the visibility of the rodents dropped by wagonloads.  And ultimately
>>> likely also their number, probably more because they did not dare come
>>> looking for food than through actual killings.
>> Perhaps you might check in some mouse trap channel, e.g.
>>  https://www.youtube.com/watch?v=zTx5y_bufwk
> Need to be live traps because of the lady of the house, and constantly
> baiting them and driving the prisoners off to the other side of the
> canal gets old.

You can choose on that channel.

> Also doesn't put much of a dent in the population.  And
> live traps for rats are hopeless.  You capture about three rats per trap
> type.  Then they merrily run around the trap, somehow manage to fish out
> the bait from top or side, or blockade the mechanism with rocks and/or
> debris.  First generation rat poison (in order to at least keep the
> kitchen free from nightly visitors) doesn't faze them all that much.  I
> think we handed more than three packages in our kitchen (at least the
> nightly treat kept them from foraging too much elsewhere) before we gave
> up on that.  Which is ugly because with that stuff at least secondary
> poisoning (namely birds of prey or cats descending on the victims) is
> not much of an issue as the stuff is metabolized within a few days.
> At any rate, it should be clear that I know much more than I'd really
> want to about this issue.  Our cats are at best so-so for rats, but they
> definitely are without much of an alternative concerning the mouse
> density.  We didn't get them lightly, particularly so since cats are
> territorial and we already had the useless cat in the accordion video.

A farmer on the BBC somewhere found cats to be the most effective rodent 
control method, but he had rather a lot, something like this:

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