So, a male scarlet tanager flies into a forest where he meets an irresistible rose-breasted grosbeak. They share some tasty insects, and the rest is history. Or is it? What happens in a forest, doesn’t always stay in a forest. In fact, this encounter resulted in a hybrid: This male bird, found in Pennsylvania, is the hybrid offspring of a male scarlet tanager (Piranga olivacea) and a female rose-breasted grosbeak […]
What better way to study an animal’s movements, schedules, and behaviors than to attach a tiny tracking device that can record where they go? At least that was the intention when scientists attached tiny tracking devices to several Australian magpies. They had planned to train the birds to visit a special feeding station that was designed to charge the tracker, download data, or release it, all using a magnet. Instead, […]
Arizona’s physiologists met in October to talk about Rocky Mountain Spotted Fever, urbanization, the evolution of walking and vocalizations, snow leopards, and diet. Here are the highlights… Oral Presentations: Graduate student Luke Endicott from the Arizona College of Medicine at Midwestern University, working with R. Potter and Dr. C.R. Olson presented their research exploring how zebra finches learn to sing and the importance of vitamin A in this process. Does […]
Now featuring the Arizona Physiological Society, who held their annual meeting October 29-30. In attendance were students, postdocs, and faculty from the Downtown, Tempe and West campuses of Arizona State University, AT Still University, Glendale University, Midwestern University, Northern Arizona University, as well as the Phoenix and Tucson campuses of the University of Arizona. The Keynote Address was given by Dr. William Karasov, from the University of Wisconsin Department of […]
Researchers at Lund University in Sweden were interested in understanding how birds adapted to cold weather. Birds can’t turn up the heat in their birdhouse, so it is important for them to find physiological ways to stay warm. While they can store body fat and grow more feathers for insulation, metabolism is the primary way endothermic animals create body heat. Mitochondria produce cellular energy (ATP) but can also create heat […]
A recent review of the existing scientific literature found evidence suggesting that warm-blooded animals may be literally shape-shifting to adapt to climate changes. According to Allen’s rule, animals living in warmer climates have larger appendages than those living in cold climates, which helps increase the available surface area for heat loss to the environment. Such heat exchange mechanisms are very important in thermoregulation to avoid retaining excess heat. The authors […]
Some birds are well-known to grab hair from living animals for use in their nests. In fact, you can spend quite a bit of time perusing YouTube video clips of birds taking hair off the back of animals and even people. The new term for this behavior is ‘kleptotrichy’, which in Greek means “to steal hair”. Check out this brave little titmouse stealing hair from a sleeping fox: Source: Science […]
Mammalian red blood cells do not have a nucleus, which is different from birds, amphibians, reptiles, and fish (see image above). Many textbooks report that the absence of a nucleus provides room for more hemoglobin within the cells, which is important to fuel the relatively high metabolic rates of mammals. Hemoglobin is an important oxygen-binding molecule that allows the red blood cells to transport oxygen to tissues throughout the body […]
The USGS is investigating a mysterious illness that has resulted in numerous reports of sick or dying birds with crusty swollen eyes (even blindness) and neurological effects such as tremors, inability to stand, and lethargy. The majority of affected birds are juvenile. The illness is rather widespread with reports of sick birds in Washington DC, Maryland, Virginia, West Virginia, Kentucky, Delaware, New Jersey, Pennsylvania, Ohio, and Indiana. Since May, diagnostic […]
We are delighted to share this interview with Evolutionary Biology PhD Candidate, Anthony Basile, MS, NDTR, who is working with Dr. Karen Sweazea at Arizona State University. We asked Anthony about his research that he presented at the 2021 Experimental Biology conference. What made you interested in studying the effects of urbanization on doves? I’m sure everyone reading this has seen a bird walking around with bread or French fries […]
Life Lines by Dr. Dolittle 