Crows do not congregate in any numbers on my place although I do get some protection from nesting eastern kingbirds (several nests on property). Some difference in value of crows maybe that not all crows are the same. In Missouri we have two crow species, American and fish, with former most common and largest. Crows here , even though considered to be same as American crows elsewhere may have different cultures and relationships with red-tailed hawks. I would not be surprized if American crow is actually more than one species.
It is the open field that gets free range chickens into trouble. I am purposely allowing / promoting growth of brambles, osage oranges, and sumac to provide cover from red-tailed hawks. My problem with rooster option to keep red-tails at bay is that I can not use multiple game roosters at numbers needed. They do not seem inclined to defend chicks they are not bonded to (I produce a fair number of free range meat birds and intend to push 400 annually) and roosters, well they fight each other. I made some dominique x game cockerols and will attempt next year to get them to bond with free range chicks and to guard groups of chicks without fighting each other. I also have a dog and in about a year will get a second. Long-term problem will not be hawks but rather coyotes and red foxes. Area of about 8 acres two large for one dog when predator willing to do snatch and grab.
The consumption of head only by hawk maybe because that is all hawk can eat quickly and it does not feel comfortable sitting on ground with so many large birds around. Also live target more enticing than going back to finish something already dead.
It is the open field that gets free range chickens into trouble. I am purposely allowing / promoting growth of brambles, osage oranges, and sumac to provide cover from red-tailed hawks. My problem with rooster option to keep red-tails at bay is that I can not use multiple game roosters at numbers needed. They do not seem inclined to defend chicks they are not bonded to (I produce a fair number of free range meat birds and intend to push 400 annually) and roosters, well they fight each other. I made some dominique x game cockerols and will attempt next year to get them to bond with free range chicks and to guard groups of chicks without fighting each other. I also have a dog and in about a year will get a second. Long-term problem will not be hawks but rather coyotes and red foxes. Area of about 8 acres two large for one dog when predator willing to do snatch and grab.
The consumption of head only by hawk maybe because that is all hawk can eat quickly and it does not feel comfortable sitting on ground with so many large birds around. Also live target more enticing than going back to finish something already dead.