[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: AW: Heterodontosaurid with protofeathers
Quoting Erik Boehm <firstname.lastname@example.org>:
> --- On Thu, 3/19/09, don ohmes <email@example.com> wrote:
> > More seriously: color often does not matter as much as
> > silhouette and texture in camo, even as used today. Deer
> > camo works in dayglo orange, as example. Not something a
> > sniper would choose, of course.
> Most mammals are colorblind, with primates having re-evolved a pigment
> sensitive to another wavelength of light.
> We should assume Dinosaurs had an excellent sense of color, as birds do
> today, and that dayglo orange would most definitely stand out as much to a
> predator or prey as it does to us (but not colorblind deer).
Modern birds and reptiles often have gaudy colour patterns, despite their
predators (other birds
and reptiles) being able to see colours.
Bright colour patterns are certainly noticable in open areas (where most sexual
place), but are less noticable in partial shade or dappled sunlight, where
identifying things by their
colour patterns alone can be difficult. Alternating colours (bright or not) can
help to break up the
outline of an animal in dappled sunlight.
Tigers are a good example. Alternating patterns of black and bright orange are
very noticable to us
colour-visioned humans when a tiger is in open terrain (especially contrasted
against green grass),
but once they move into dappled sunlight they all but disappear. Tigers try to
avoid strolling about
in the open when they're stalking prey, since keen-eyed monkeys and birds tend
to spot them
easily and give off alarm calls. However given enough cover, a gaudily
patterned tiger can sneak
it's way into ambush range despite the dozens of colour-visioned tattle-tales
in the area.
GIS / Archaeologist http://geo_cities.com/dannsdinosaurs
Melbourne, Australia http://heretichides.soffiles.com