Aggression is a social behavior essential for securing resources and defending oneself and
family. Thanks to its indispensable function in competition and thus survival, aggression …

Smell is a sensory modality that is rarely considered in birds, but evidence is mounting that
olfaction is an important aspect of avian behaviour and ecology. The uropygial gland …

The first comprehensive review of all aspects of the biology of moult, drawing information
from across the literature and in all birds, from penguins to passerines. Feathers are …

Birds are renowned for their exceptional vision and the way that this enables them to survive
and navigate the world in such a unique way. However, it is now recognised that avian …

The relative size of olfactory bulbs (OBs) is correlated with olfactory capabilities across
vertebrates and is widely used to assess the relative importance of olfaction to a species' …

For a long time birds were assumed to be anosmic or at best microsmatic, with olfaction a
poorly understood and seldom investigated part of avian physiology. The full viability of …

Accurately determining avian species limits has been a challenge and a work in progress for
most of a century. It is a fascinating but difficult problem. Under the biological species …

Covering: 1950 to 2015 We compiled a data set of the compounds that terrestrial vertebrates
(amniotes) use to send chemical signals, and searched for relationships between signal …

Much of the growing interest in avian chemical signals has focused on the role of kin
recognition or mate attraction, often with an emphasis on males, with uropygial gland …

Birds, and especially raptors, are highly visual animals. Some of them have the highest
spatial resolving power known in the animal kingdom, allowing prey detection at distance …