Last week, I couldn't go birding because of my injure of foot. And I buy a new tripod that is 500g heavier than before one. This week, maybe I can go birding and ringing. Before my birding this week, I write this article about Red-rumped swallow that living in my home town. I had not known that Red-rumpeds are rare in many places, against my hometown. My hometown is Hitachi north of Ibaraki-pref, North-esat of Tokyo.
Be heard like "Gyu-igyui"or"nyu-inyui" is Red-rumped's one of the call. It really cute! I think Barn swallow's call "pili!" means alarm, however Red-rumped's "pili!" maybe not mean alarm. I observed the call was used in many usual situation in a lot of time. "mi-nyu-bibibi" is used the situation that a Red-rumped recognized to other individuals "come to my place and how about talking or relax with me?". In other wards, this call means causes gathering, but it is used many time in daytime not evening.
The first time I saw Red-rumped is 3 glade of elementary school. One day I saw Red-rumped in my fieldguide, the next day I find two Red-rumped in the time I attended school. I remember the situation really sharp.
Other individual. Red-rumped do complete post-breeding molt adult and juv. And the difference of male and female in measurement is small and has large overlap. So dividing male to female and judging age is not easy. But I think this individual has long tail so maybe male.
In northern hemisphere, there are some species like "red-rumped" swallow. In old world, Red-rumped swallow and Striated swallow are living. In new world, Cliff swallow and Cave swallow are living. Above 4 species are resemble. The trait of there is red or brown panel in rump, reddish face, pale neck and black head and back. Considering Barn swallow that is the species success in around the world, above traits are useful of cognition of own species. Red-rumped increase the rate of pale-body part for dividing there from Barn swallow? I think it is likely. I think the predation of swallow is not affect for evolution because there are not the predator intensive predation to swallows. I don't know the effect of reddish-rump for breeding, so I want to know about it.