While avian influenza virus crossing the species barrier and directly infecting humans happens only occasionally, human-to-human spread has been rare and not sustained. But mutations in the virus or genetic reassortment could likely result in sustained transmission between humans thus increasing the risk of a pandemic influenza.
Based on a DNA analysis of a fossilised eggshell fragment of ostrich, Indian researchers have for the first time found molecular evidence to confirm the presence of these birds in India more than 25,000 years ago. Scientists found 92% genetic similarity between the fossil eggshell samples and Struthio camelus, an ostrich species found in Africa. … Continue reading Ostriches existed in India over 25,000 years ago, DNA evidence shows
Published in The Hindu on April 12, 2012 Many animals and migratory birds use some kind of navigation system based on magnetic clues. This helps them find their way even when they travel hundreds of kilometres. According to current evidence, a light-dependent “compass” that is located in the retina is one such tool. But in … Continue reading Pigeon navigation: magnetic sensors in beak a fallacy, says study