On Monday I was leaving campus at the end of another long day. My partner and I were in the library parking lot and I was worn down after a lot of time at the computer working on dissertation research. I decided to study wildlife to be outside, but after data are collected—especially as one’s career progresses—most time tends to be spent inside analyzing data and writing about it. As we were about ready to get into our car, I heard what I was pretty sure was a Blue Jay imitating a Cooper’s Hawk from a row of oaks that bisected the parking lot. I’d seen a Blue Jay in the oak trees in that direction just before I heard the interesting call.
Here is the type of call, uttered by an actual Cooper’s Hawk, that I thought I’d heard:
Like I often do, I wandered away toward a bird with little or no explanation. Maybe I said, “there is a Blue Jay over there.” Luckily, my partner is an ecologist, so she understands—or, at least accepts—my strange behavior.
As I approached the tree line, it became clear that indeed a Blue Jay was imitating a Cooper’s Hawk while foraging. Here is the footage:
Blue Jays have been observed on many occasions imitating/mimicking other species. Often, I’ve noticed, they imitate their potential predators. There are several reasons that the jay I saw could have been imitating a Cooper’s Hawk. Given that it appeared to be foraging alone, the bird might have been calling as a way to deter other birds from competing for a valuable food source. Little acorns were just beginning to form on the oaks, but I think the jay was eating something else on the ground. The Blue Jay might have been just showing off a unique call which it had learned that could, when combined with the other calls in its repertoire, impress another jay. It is also possible that the bird was indicating nearby danger, though I don’t think that was the case in this instance. However, when I studied Blue Jay vocalizations for my Master’s research, I frequently observed jays imitating predators (Red-tailed Hawk, American Crow) as I approached Blue Jay nests. It was as if they were indicating danger to their mates by imitating a species that was dangerous to them. Or maybe they had been trying to scare me off by imitating something that scared them.
My favorite memory from my Master’s research is the afternoon when I heard a pair of Blue Jays utter uncannily-convincing American Crow calls as I approached their fledglings. A recording from that day of that call type, as well as other Blue Jay call types that I described in a recently-published study, can be found at the below link. The most convincing American Crow call is at the very end of the file called ‘NamesAndCalls_Row3.’
Yesterday, when I was leaving campus on my bike, I noticed a Cooper’s Hawk flying high overhead. I was only a few hundred yards to the northwest of where I’d recorded the Blue Jay on Monday. I put down my kickstand and watched as the hawk boldly flew above me, clearing carrying something in its talons. Was it my Blue Jay friend?!? No, I was able to tell, it was some kind of rodent. A little relieved, I pedaled home.
This morning, at around 7:00 am or so, I was sitting in the backyard with my loyal canine companion at my feet. We were both thinking about what we wanted to accomplish today. As I thought, I listened to several Blue Jays calling around the neighborhood. Within the last couple weeks, a pair of Blue Jays successfully hatched young from the sycamore behind our house and ever since I’ve been listening to the calls of hidden fledglings as they beg for and then noisily receive food. But this morning it was just adult calls, mostly the ones that jays utter when they are flying and attempting to stay in contact with allies. The calls suddenly changed to what I call ‘Burry Descending Jay,’ and several American Robins began ‘tutting,’ so I wondered if they were concerned about something.
Then, like a low and straight arrow about 15 feet above the ground, a Cooper’s Hawk flew from east to west across our backyard almost right over me. And the jays kept calling, as if I needed to be convinced more to share about the special birds that we call Blue Jays and one of the many challenges that have shaped them. Gradually the ‘tuts’ of the robins stopped and the Blue Jays resumed calls that generally don’t indicate danger. I carefully listened for what jays and other birds will teach anyone who pays attention. And all, for the moment, again became calm.