Weighing the Great Auk
New evidence suggests that the Great Auk was not nearly as heavy as previously thought
Why do birds get smaller?
How long-term winter bird ringing unravels body size shrinking in response to climate change
Being larger against all odds
Mediterranean Yellow-legged Gulls are larger and have longer wings than their Cantabrian-Atlantic conspecifics
Parrot poaching in Peru and Ecuador
Preferred species poached far beyond their abundances in the wild
The mysterious basis of egg shape in birds
How do birds produce asymmetrical eggs?
Gardens as conservation tools
Human-provided resources can benefit hummingbirds and plants in Colombia.
Feather colouration and the (mis)measure of patterns
How to objectively “measure” colouration in species with complex patterns of spots and/or lines?
The Dead Sea Sparrow: one or two species?
Combining several lines of evidence to reach a solid taxonomic decision.
Aposematism in birds
Aposematism and mimicry in birds
Rapid morphological evolution on remote islands
Resolving the taxonomic status of an island dwarfism warbler population