I finally worked out an easy way to keep birds (cardinals) out of our pea patches.
You can see the photo of how they started to shred the peas. They started on the snow peas, which we covered in Remay. That did keep out the birds but made it very inconvenient to harvest fresh snow peas. So I left them to mature for seed/soup peas. Today I uncovered the row to begin the dry pod harvest and discovered that the Remay was perfect habitat for slugs and earwigs which were making little round holes in the pods. But not too bad damage overall.
Meanwhile, the birds had started in on the 3 rows of Amplissimo Viktoria and Rimpau's Green soup peas. Not enough Remay for all of them so I hung some CD's and bird tape, knowing that in the past that didn't work. I added in the DeWalt speaker and MP3 player with radio and tuned in WI Public Radio talk station and cranked the volume up to high. That mostly worked but what I really wanted was something with more erratic movement and sound. I have been looking at those fan inflated, tube guys like you see at businesses, but way too expensive and energy consuming. So instead I set up a couple of our oscillating table fans with bird scare tape clipped to the front grill and turned them on high. They are mounted on ladders, tied down to keep them from getting blown off the ladder. If it rains, we put plastic bushel baskets over them. It's easy to turn them on at 5:00am by hitting the breaker that powers the shed where they are plugged in (50'+40' and 100' extension cords reach). Each fan draws about 50 watts. The first fan has 3 streamers clipped to the grill. The second has 1 long strand threaded through the grill and clipped on with the same office binder clips as the first. The streamers extend about 2 to 2.5' from the fan. No more bird damage as long as we have the system on early enough in the morning and run it until dusk. There have been a few very low hanging pods that look to have been munched on by chipmunks, but even they seem to be put off by the crackling noise of the fan streamers.
We've used the radio in the past to discourage downy woodpeckers in our corn patches. By itself it's only moderately effective as they're not even put off entirely by actual humans. I think the fans will add in well to the radio sound system.
Today I did see that the price of the fan tube guys, called air dancers, has come down with a 6' 6" diameter version about $50 with the blower on Amazon. But that still costs over twice what the table fan and streamers go for. And the table fan can be used as a table fan!!! Or for drying piles of beans, etc. in the greenhouse.
I have a video of this in action but my file type .AVI doesn't work on this forum. What's the best method to post it?