I had a wonderful sighting of the female kestrel whose photo is featured in this post. It sat on a dry tree in the middle of the Thar desert for a long time, scanning the surroundings. I suppose it was looking for jirds or other rodents to eat. I loved that sideways glance with which she dismissed me as being of no consequence. I had no choice but to slink away.
The common kestrel (Falco tinnunculus) seems to be really common, being found over all of Asia, Africa and Europe, except only Siberia and the Sahara, Gobi, and a part of the Thar desert. Interestingly, it is found in the more inhospitable parts of Thar. One can speculate why. The common Kestrel evolved about 2 million years ago, after the Sahara and Gobi were formed. But the Thar desert developed later, so the Kestrel must have just acclimatized to the change. I wonder how this hypothesis could be tested.
The male differs from the female most visibly in the colour of its head: it is pale unlike the brown of the female. There are other differences in plumage as well: the markings are less prominent on the male. Interestingly though, it is in size that there is a very remarkable sexual dimorphism: the male is smaller. I’ve written about how gender politics shapes the bodies of raptors which pair bond. The combination of relatively drab colours and smaller size falls directly in line with the argument which I had explained at length: that this has to do with the female tending the brood while the male hunts for the family. I was happy to see that this has been put to observational test and the hypothesis does seem to hold.