Norway's small birds face many challenges during the winter, ... The goldcrest, Norway's smallest bird at only 5-6 grams, and the slightly larger coniferous tits (coal tit, crested tit, ...

Despite their colorful appearance, blue jays are actually in the genus corvidae, the same as crows and ravens. These birds are typically 9 to 12 inches long from beak to tail and weigh under 3.5 ...

Birds of a feather: Pigeon head crest findings extend to domesticated doves. ScienceDaily . Retrieved June 2, 2025 from www.sciencedaily.com / releases / 2015 / 06 / 150623180305.htm ...

In a forest in southern Sweden in October 2022, we set up bird feeders that were routinely visited by large numbers of great tits along with lower numbers of blue tits, chaffinches and crested tits.

The head crested birds had one version of the gene, a single mutation that made an aberrant protein (Arg758Cys) responsible for the feather difference between them and uncrested birds.