A team of researchers, including University of Edinburgh paleontologist Stephen Brusatte and Swarthmore College Associate Professor of Statistics Steve C. Wang, cataloging 853 skeletal characteristics in 150 dinosaurs and analyzing the rate at which these characters change, and they found that "there was no grand jump between nonbirds and birds in morphospace.
" In other words, birds didn't suddenly come into existence, but evolved, bit by bit, or characteristic by characteristic. But when birds were finally a thing, they went crazy. "Once it came together fully, it unlocked great evolutionary potential that allowed birds to evolve at a super-charged rate.
Cocks (almost) don't have a penis, a trait common to 97% of bird species, but they can grow one when the expression of the Bmp4 gene is prevented
. The expression of this gene causes the percursor of the phallus in the chick embryo to undergo apoptosis (cell death) and Bmp genes are also involved in 3 other bird traits: feather development
and beak shape
. In penis-less bird species, copulation requires a sex maneuver nicknamed the cloacal kiss
) which requires a full cooperation of the female
(3 min of tender parrot sex
). In species where males have a penis, like ducks, females are less lucky: the coevolution of the rather convoluted morphology
of male and female genitalia has been hypothezised to occur through sexual conflict
]. The evolutionary mechanisms that drove phallus reduction in most birds species are still unknown.
How to hatch a dinosaur:
'So making a chicken egg hatch a baby dinosaur should really just be an issue of erasing what evolution has done to make a chicken. Every cell of a turkey carries the blueprints for making a tyrannosaurus, but the way the plans get read changes over time as the species evolves.' [via
A new round of genetic tests has confirmed it:
The 'big lizards' of our childhood fantasies were more likely 'big birds.'
In fact, they probably even had feathers
, and looked more like this
. Mind blowing, I know, but I guess this demonstrates that, despite what some
may think, science really doesn't have a problem admitting that it got something wrong when new evidence comes to light.
Birds that rap
and cows with accents
. The big picture is urban adaptation
, which is pretty cool. (...and the egg
Birds are not descended from Dinosaurs.
The latest in the ongoing debate about the origin of birds and whether they evolved from dinosaurs or from a earlier common ancestor. Chinese scientists report the discovery of a 120 million year old bird fossil that had feathers and could clearly fly.