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If you live in the country near a river or forest you will probably have rats nearby. When the weather turns cold they want to come inside your house or barn where it is cosy.
There are a lot of Instructables for trapping rodents but if you have more than one or two, trapping is really not a satisfactory option. This bait station is easily made from two plastic milk bottles and keeps the bait away from pets and birds.

Step 1: Tools

Common tools needed are a hammer, needle nose pliers, box cutter, and utility scissors.
Several sizes of nails and heavy staples are also used.
How does this keep the birds out? The picture in step 7 looks like a nice bird sized hole.
They could get in but small flying birds don't seem to be interested in the bait on the ground. We have one species of large flightless birds (wekas) and another large bird species that doesn't like to fly (pukekos). The dozens of those birds we see every day have never gone up to the bait stations we can see from our house. The bait stations are moved around a bit during the night indicating it is the rats which are dining from them. The opening in the back could be made smaller, rats don't need much room to get into a space.
<p>they don't seem to be interested?</p><p>Not good enough. It should be covered up.</p>
<p>While I do understand your concern, you need to remember that rats and mice find food (or in this case bait) mainly by smell. Birds tend to go by visual cues. Bait that isn't brightly colored and in the bird's line of sight is rarely a problem. Also, the fragrances with which baits have been treated attract rats and mice but do nothing for birds. As a result, birds getting into rodent bait stations and eating the bait is not a known problem in practice.<br><br>I also should point out that _any_ bait station, including commercially produced ones, by necessity need to provide access for a rat. Since there are birds that are smaller than rats, it is technically impossible to design an effective rat bait station that will keep out birds at the same time.</p><p>In closing, rats eat bird eggs and young birds, so in practice more birds tend to fail to reach a ripe old age due to rat activity than get killed in rat bait stations.</p><p>So I agree with ClareBS in that collateral damage among your local bird population is not a valid concern.</p>
<p>FARNAM JUST ONE BITE you get on Amazon is the best bait.</p><p>Please be responsible when dealing with poison and make sure to read this article.</p><p>ThanQ</p><p>https://www.audubon.org/magazine/january-february-2013/poisons-used-kill-rodents-have-safer</p>

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Bio: Retired teacher from long ago and semi-retired graphic designer who loves the outdoors. American expat living in New Zealand for over 20 years.
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