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Home >> Gourd Tips and Information
 
The following article was written by Chuck Abare.

Recently I had the pleasure of having a long phone conversation with Ron Seekamp, from Fridley, MN. As a lot of folks know, Ron is the man that played around with ‘adjustable” crescents which got him notoriety and was written up in the Purple Martin Update for his efforts. Ron didn't have the internet at the time, but he'd read about my efforts to increase the usage of crescents in purple martin colonies. We talked in length about martins in general, housing and of course the starlings, and what the crescents meant to them. I asked in detail about his method of adjusting his crescents and he ended up sending me one for my personal inspection. Being from the engineering field, this thing wasn't that hard to figure out and just maybe there might be some room for just a little improvement as far as an easier method to use, plus I'm a gourd man and, since the one he sent me was made for houses, I definitely wanted to figure out how to adapt them to gourds. I wanted to figure something out that any average Joe or Mary Landlord could do to make these things and then use them at their colony sites.

As of late there's been a lot of concerns about people changing over to regular sized 1-3/16" crescents and of course, their anxieties of watching their birds try and try and continually fail to enter these forms of entrance holes. I’ve had this on my mind a lot and wonder if there really are some birds that just can’t figure them out . I don't see it at my site. My birds don't even know they're there and act just as if they were round holes. Along with that, there’s all the folks that are wondering if a ‘new’ colony can be started with crescents alone. Both questions have been answered many times, but still, folks balk at using them or others refute the need for them at all. Because everyone’s situations are different and no one scenario will work the same for everyone, some of those questions get pretty tough to answer.

However, throughout the purple martin world, we are quickly beginning to find out that the use of some form of SREH is now a requirement in a martin colony simply because the European starling has become a major factor in keeping martins. These pests are now the most populous bird species in the U.S., are just about everywhere, and sooner or later, they will visit your sites. I don’t know about everyone else's situations, but I have to work for a living and I’m just not able to spend the entire day watching my (bird) site. I am infested with starlings so crescents are a requirement. My job requires that I leave the house each day and plus, I do have other things that need doing and I just can't be at my site 24 hours a day to protect it.

Still, I’m asked these questions time and again because of my web page… Are crescents really necessary? Can a new colony be started with them? What about the new excluder? Are these SREH's as good as they say they are? How do I make them? … etc, etc…

So, to these folks, I submit these thoughts and I do so in a couple of different scenarios. There are probably a lot more, but I just don't have the time to write about all of them. Some thought will have to be given to the individual scenario of the landlord reading this. In all scenarios presented here, I’m going to assume that starlings are a factor, because if they aren't now, sooner or later, they will be. Also, these scenarios include natural gourds as one of the housing selections.

Scenario #1:
Your housing, (new or old) has regular round entrance holes. The martins come and decide to set up shop, but the constant barrage from starlings ends up driving them away or worse yet, you lower the house and find dead martins inside the compartments because of the starlings treacherous ways.

Scenario #2:
Your housing (new or old) has crescent openings on each compartment that is the normal 1 3/16" size to begin with? Martins come and figure them out and all is fine and good. You have your martins and they are safe from the starlings.

Scenario #3:
Martins come and find regular sized crescents (1 3/16") however after trying for a good length of time, they just can't seem to figure them out. You, the landlord, get anxious and because you don't want to lose your martins, either replace the crescents with round or go and whittle the crescent larger so that they can get in. Yes, you've now allowed your martins to get in, however, you've done two things. First, you've ruined the crescents and now they are no longer starling resistant. Second, the starlings, who are just as hungry for nesting cavities as the martins, are also able to negotiate these whittled out crescents and thus, there is no difference than if you had round holes. Your martins are no longer safe and the starlings can again do their thing and your martins could very likely end up dead.

I am assuming every one is getting my point here so let's look at one more scenario that can be applied to either new housing or old housing.

The Excluder
I'm leaving this one alone for a couple of reasons. First, the inventor, a man by the name of Duke Snyder, is apparently trying to patent the design so I don't want to get into this kind of mess and secondly, I've found that the design is very difficult for the average person to make and so far my attempts at making them accurately have proven difficult. In order for these to work, I believe these need to be stamped with tooling dies to be accurate and apparently Duke is interested in some return for his time. I'm not trying to make this hobby difficult, I'm trying to make it easy and I'm trying to do some good for the martins by allowing the average landlord to be able to make and use the tools of this hobby. Also, my attempts to add these Excluders to gourds has proven to be extremely difficult because of the curved surfaces. However, crescents are no problem at all. Secondly, excluders seem to have a lot of problems with 'thick' wooden houses. The birds just can't seem to negotiate the thick walled houses with Excluders.

Enter the Adjustable Crescent
OK, here's what this whole thing is leading up to. What if you could have the BEST OF BOTH WORLDS? What if you could have your large entrance holes to allow martins to get in, while at the same time, gradually changing to regular crescents and, during the process of changing to crescents, 'training' your martins to use them.

Training Martins???
No, I haven't lost it. Now just stop to think for a minute. With the increased sized crescents, say 1-1/2", martins will treat them exactly as if they were regular round 2" holes. They'll be popping in and out just as if nothing was amiss and you the landlord will be happy that your martins are able to easily negotiate these large entrance holes. As the season goes on, the martins decide on a cavity and begin nest building. Many trips are needed to build the nest. (Also, here is where good record keeping is a necessity).

After the martins have started nesting, you the landlord, go out and lower the house and while it's down, you CLOSE THE ADJUSTABLE CRESCENT by 1/16". Raise it back up and let the martins get used to it. Two or three days later you repeat this same procedure. Another 1/16" is gone. Still the martins quickly adapt and continue with their nest building. Again, two or three days later, the same thing, another 1/16". Again, the martins adapt. Get the picture. Before long, your crescents are all the way down to 1 3/16", your martins are trained to use them and the starlings are foiled by not being able to enter.

Now, what do you think? Did we train the martins? Are they not able to use the crescents just as if they were there all along?

So, let's stop to think some more. If we started with 1 1/2" high crescents, lowering them 1/16" every other day or so would be 5 changes to achieve the 1 3/16" crescent that is 99% starling resistant. That's only 10 - 15 days that we take our martins from starling loving large holes down to starling hating resistant holes. And, the beauty of it all, the martins have learned to use them and don't even know about it.

I know this sounds like a nutty thing, but I'm serious. In fact, I'm willing to bet that we don't even need to go all the way up to 1 1/2" to begin with. We may only need to go to 1 3/8". Since my entire site is nothing but the regular crescents, I need to find someone that wants to change so that I can do some in-depth studying to see just where it can be started. I know of a couple of landlords that still have round holes and are wanting to make the change, so we'll see what happens.

To further illustrate my thoughts, I've added a few pictures showing three different sizes of openings.
adjustable crescent SREH in full open position
This one shows the crescent adjusted to the top of its range, giving a full 1-1/2" opening for the martins to get thru. The small hole on the right is the pivot point and the slot on the left allows for adjustment......................

crescent SREH adjusted to 1-5/16

This one shows it adjusted down to the 1 5/16" range.............................

ajustable crescent entrance at 1-3/16

And this one shows it adjusted all the way down to 1-3/16". This height should stop 99% of all starlings from using these homes.

I'm a firm believer that if done properly and given enough time, any martin can learn to negotiate the fully closed crescent, especially if he/she was 'trained' to do so from the beginning. If you have a starling problem or are just starting out and are afraid of standard crescents, then just maybe this is an option for you. And, before you know it, your martins will not only be negotiating these things just like mine, they will be safely nestled in the back of their gourds or house compartments where starlings just can't reach.. Give them some thought. They're easy to adapt to wooden houses, and easier to use.

Chuck Abare

Athens, AL
 
           
 
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