Can I make feed less appealing to sparrows?

You pay for a treadle feeder long before you finally buy one. Even a bad treadle feeder will stop sparrows but if you are going to spend $130 or more you just as well get a feeder that keeps mice and rats out of the feed.

Key features if you want it to keep sparrows and rodents out.

An inward swinging door for safer use and faster training. If they tell you to block the door open for weeks during training, you will be training the vermin too.

The door needs to be spring loaded to preload the tension on the door. Springs increase resistance as they stretch out, the door become harder to open the more it opens. Without springs, the vermin just push the lid up or the door open and chow down. The spring should be infinitely adjustable as well so you can fine tune the feeder for your smaller birds and if sparrows are the only issue right now you can set the spring tension quite light. Leverage is involved, there might be 10 pounds of pull on the door to get it to open but only three to four pounds on the treadle to operate it. That might leave the door with only one to two pounds of resistance but that is enough to stop vermin.

The treadle step HAS to be narrow and distant or the vermin will gang up on the treadle and eat the feed. Around 7 to 8" distance between the treadle step and the feed is enough.

All metal of course, no plastic that can be chewed through.
 

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