Diagnosing in-flight adjustment to wind by birds is challenging, since they may follow landmarks, take detours, soar in thermals or become wind drifted. Gulls are noted opportunists and flight generalists...
Body temperature is a key physiological property of any animals, and its measurement is thus a valuable tool in ecological and physiological studies. In birds, variation in body temperaturer has been related to a range of parameters...
Like the rainbow shimmer on a soap bubble, the blue color of this male tree swallow (Tachycineta bicolor) feather is iridescent. Light reaching the feather is reflected by its microstructure like a myriad of small mirrors, making it look very bright...
When I signed up to move to Kaua‘i and began an M.Sc. project studying the nesting biology of two recently-listed endangered forest bird species, the ‘Akikiki and ‘Akeke‘e, I knew I was in for a rewarding challenge!
Ever since I first visited Ammarnäs in Swedish Lapland in 2007, Red-necked Phalaropes captured my special interest. Well-known for their reversed sex roles, their pelagic lifestyle outside the breeding period has hampered the study of their non-breeding biology...
During the spring of 2012, Gabriella Jukkala was just about to graduate from Northland College. After extensive discussions, Gabby and I became interested in how adult loons might protect their chicks during their fragile first weeks of life...
For a long time, I’ve been fascinated by the variation in breeding systems, morphology, habitats and other general lifestyles of waders. When I first learnt about light-level geolocation as a technique for tracking the non-breeding movements...
With a little bit of ‘basic math’, Russian biologist Eldar Rakhimberdiev shows how changes in seasonal survival may be used as a tool to detect problems in bird populations. ‘A dip in survival during a certain period or in a certain place, means the population...
In late winter 2013/14 the crow fieldwork crew of the Wolf Lab at the Evolutionary Biology Centre in Uppsala, Sweden, started planning the next field season. The goal was to sample two dozen hooded and carrion crow nestlings from sites in Sweden and Germany...
avianbiology
24 October 2014
Male testes come in all shapes and sizes. Male mammals usually have two testes that are equal in size but birds, for some unknown reason, usually have one testis bigger than the other, and it is often said that the left testis is larger than the right.
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