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The article focuses on the behavior of breeding birds while nesting and rearing their offsprings, along with several photographs related to the same. Atlantic puffins spend the winter months at sea, and in breeding season their beaks and feet turn orange. Bald eagles build their nest continuously and use them year after year. Photographs of Atlantic puffins, male bald eagle, and emperor penguins are also presented.

The scientists chose chickadees because they frequent feeders during winter and have high daily energy requirements. Scientists at Oregon State University (OSU) have reassuring news for the millions of U.S. households that feed songbirds during the cold months. To investigate the question, Rivers and his colleagues outfitted 67 black-capped chickadees (above) with radio-frequency identification tags and studied the birds' feeder habits under different experimental conditions in the wild. [Extracted from the article]

Reports on the significance of shade-grown coffee farms to the habitat of migratory birds in Oaxaca, Mexico. Facts on the consumption of coffee in the U.S; Problems in cultivating sun-grown coffee; Number of bird species supported by shade-coffee plantations.

To protect public health, the United States half a century ago began enacting powerful laws and regulations to curb air pollution. To investigate, scientists from Cornell University and the University of Oregon combined bird-observation data from Cornell's eBird program with federal ground-level pollution statistics. [Extracted from the article]

Presents information regarding the flight of birds. Flight as the result of perfect coordination between every part of the body; Need for birds to have a hollow skeleton that is light yet string to stay aloft; Manipulation of certain feathers for maneuverability.

To save energy on winter nights, many bird species can reduce their body temperatures by several degrees, but doing so may make them sluggish and easy targets for predators. By contrast, the scientists found no difference in the body temperatures of males given additional food. [Extracted from the article]

By programming computers to distinguish photos of different birds using the patterns of their plumage, a team of European scientists has built the first artificial intelligence tool capable of identifying individual small birds in the wild. Early in their project, the scientists developed a camera technique that enabled them to collect images of specific groups of three bird species: zebra finches (right), great tits and sociable weavers. While other scientists have used AI to identify individual primates, pigs and elephants, those techniques have not been tested on birds. [Extracted from the article]

A team of U.S. and Brazilian scientists report that they have recorded the loudest bird calls ever documented. The source: dove-size male white bellbirds (left) that sing during mating rituals in the northern Amazon. In previous work, co-author Mario Cohn-Haft of Brazil's Instituto Nacional de Pesquisas da Amazônia found that bellbirds have unusually thick ribs and abdominal muscles, most likely tied to their loud calls. [Extracted from the article]

The article focuses on wildlife photographer Jack Jeffrey who specializes in Hawaii's native birds, including background information on his work as a wildlife biologist at Hawaii's Hakalau Forest National Wildlife Refuge and photographs of the endangered Hawaiian honeycreeper within the issue.

Introduces a series of articles on birds that populate the boreal forest.

Focuses on the preferred food of birds in North America. Use of feeding habits to attract birds; Styles of seed feeders; Context of the United States Fish and Wildlife Service study on birds; Information on the food preferences of native species.