Colour the birds red
نویسندگان
چکیده
منابع مشابه
On the colour-colour properties of the Extremely Red Objects
The colours of the galaxy class known as Extremely Red Objects (EROs; R− K > 5) are considered to be consistent with two distinct galaxy populations at high redshift: evolved ellipticals or young dusty starbursts. In this paper the properties of EROs, spanned by the five photometric bands RIJHK, are investigated as to the possibility to distinguish between these two galaxy populations using onl...
متن کاملRelative colour cues improve colour constancy in birds.
A ripe strawberry looks red to our eyes in sunlight and in the green light of a forest, although the spectrum of light reflected from its surface differs dramatically. This is caused by two effects: colour constancy and our ability to learn relative colour cues - the ripe strawberry remains relatively 'redder' than an unripe green strawberry. While colour constancy - the ability to recognize co...
متن کاملColour polymorphism in birds: causes and functions.
We studied polymorphism in all species of birds that are presently known to show intraspecific variation in plumage colour. At least three main mechanisms have been put forward to explain the maintenance of polymorphism: apostatic, disruptive and sexual selection. All of them make partly different predictions. Our aims were to investigate evolutionary causes and adaptive functions of colour pol...
متن کاملThe colour of an avifauna: A quantitative analysis of the colour of Australian birds
Animal coloration is a poorly-understood aspect of phenotypic variability. Here I expand initial studies of the colour gamut of birds by providing the first quantitative description of the colour variation of an entire avifauna: Australian landbirds (555 species). The colour of Australian birds occupies a small fraction (19%) of the entire possible colour space and colour variation is extremely...
متن کاملWhy birds eat colourful grit: colour preferences revealed by the colour of gizzard stones.
Colour preferences from sexual or social contexts are assumed to have arisen owing to preferences for specific kinds of food, representing a sensory bias, but once colour preferences have evolved in a sexual context, they may also be expressed during foraging. We tested whether preferences for specific body colours (i.e. plumage and soft parts) were related to colour preferences for grit ingest...
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ژورنال
عنوان ژورنال: The Forestry Chronicle
سال: 1973
ISSN: 0015-7546,1499-9315
DOI: 10.5558/tfc49205-5