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| Eastern Wild Turkey Gobbler: Canon 5D MK III-Canon 500mmF4-ISO 1000-1/2000 Sec. F4.5 | 
When most think eastern wild turkey gobblers they 
think of the peak of the gobbling season, which usually occurs in April,
 but to a certain extent the activity actually begins much earlier.  The
 mature gobbler above shows little signs of interest in hens or 
competing with other gobblers, except that his head is perhaps a bit 
deeper red than ordinary for this time of year, while the gobblers below
 show much more coloration and their heads are slightly swollen looking.
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| Bachelor Group Of Mature Gobblers : Canon 5D MK III-Canon 500mmF4-ISO 1000-1/640 Sec. F4.5 | 
This can change moment by moment and the gobbler can 
quickly go from having a slender, dull looking head to a bright colorful
 head that shifts hues rapidly.  Since hens are not receptive at this 
time of year, this is usually brought on by the appearance of a strange 
gobbler or another bachelor group of gobblers.  In such a case the birds
 may strut, gobble, and chase each other.
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| Gobbling: Canon 5D MK III-Canon 500mmF4-ISO 1000-1/1600 Sec. F4.5 | 
On several occasions I have seen two groups of 
gobblers confront each other, with the more aggressive group forming a V
 formation and charging the other.  Sometimes a kicking, thrashing melee
 ensues, but often one group gives way and flees the scene before 
contact is made.  This is just one of the things that make these birds 
so fascinating.
Some will question my frequent use of 
ISO 1000 in relatively good light, but I have found that setting to be 
so good on the 5D MK III that I often have the camera set there if I 
anticipate rapid action.  The bottom line is each photographer should 
experiment and say what is acceptable to them, but it is important to 
remember that in many cases the ability to shoot at the high ISO 
settings improves with each generation of cameras.  This is nothing 
scientific, but I feel safe in saying that ISO 12800 on a 5D MK III is 
superior to ISO 800 on the old Canon 10D.
Originally published at 
Pennsylvania Wildlife Photographer by Willard Hill.