Students of all ages often erroneously believe that adaptations result from some overall purpose or design. Haberlein sold it to a famous Creationist of the time, which ended up proving the likelihood that the theory of evolution was correct instead of Creationism.
Ask students to study them.
Briefly summarize the Ground-up Theory of Flight. One of the key aspects to appreciate about Prum's model is how it opened up new possibilities for understanding the relationship between birds and dinosaurs. Filoplumes and down may arise from the apterylae. Since females are the prime care givers, evolution has helped select females to display duller colored down so that they may blend into the nesting environment.
Xing Lida and Song Qijin. Class structure and book availability will determine this. Due to the normal demands on class time, you might want to consider using this lesson with an advanced group of students, or as extra credit for highly motivated and focused students. The available specimens suggest that members of these groups had scaly skin, but the possibility that they are partially covered by filamentous integumentary structures cannot be completely excluded.
In addition, the type and distribution of protein keratin in feathers and scales differ Sawyer et al. Line drawing of reconstructed skull of Sinornithosaurus. A typical vaned feather features a main shaft, called the rachis. In addition, barbs are hypothesized to evolve before barbules because barbules develop within layers of pre-existing barb ridges Prum This lightly built predator was an early relative of T.
In another position, this switch causes horizontal growth in a structure: In the traditional functional approach, the function of a structure explained its origin. Feather waste has been used in a number of industrial applications as a medium for culturing microbes,  biodegradeable polymers,  and production of enzymes.
In the 15 chapters of Feathers, Hanson details a sweeping natural history of feathers as he investigates their function in birds of insulating, cooling, waterproofing, enabling prolonged efficient flight, attracting mates, and protecting birds through camouflage.
Unfortunately, feathers were not preserved on this specimen, leaving open the question of what type of integument short-armed dromaeosaurids had and whether they possessed large wings with pennaceous feathers like their smaller Liaoning relatives. Then, with a dramatic flourish, the pigeon-sized creature stands on tiptoe, puffs up its strikingly coloured plumage, and starts to dance jerkily from side to side, all the while producing clicks and shrill little calls.
Sexual dimorphism in plumage and color patterning in Late Jurassic and Early Cretaceous dinosaurs suggest that display functions played a key role in the early evolution of pinnate feathers Source: Zhenyuanlong adds yet more diversity to the Liaoning dromaeosaurid fauna, helps further reveal a distinct short-armed bauplan among dromaeosaurids, and illuminates previously-unrecognized homoplasy that complicates dromaeosaurid phylogeny and suggests that the Liaoning taxa may not have formed their own clade.
What was the traditional view of how feathers evolved. Did you find this resource helpful. What might another good title be for a book or article on feather evolution. How Fearsome Reptiles Became Birds. Nearly all of these feathered dinosaurs are carnivorous theropods, and the vast majority of the new finds are exceptionally preserved specimens from the Liaoning region of north-eastern China, although some hail from Mongolia and a smattering of finds have been made in Europe, North America and Madagascar.
Apparently there to confound biologists, what it generally does is demonstrate the ignorance of the asker with respect to evolutionary theory. The lesson is intended to help students meet learning goals by understanding:.
Feathers vs. scutate scales morphogenesis. Although feathers cover the majority of the body, most common day bird's possess scaled tarsometatarsi and toes, whereas some species, such as the owls, have the upper side of their feet entirely covered with contour and downy feathers.
Home» Publications» Evolution of the morphological innovations of feathers. Evolution of the morphological innovations of feathers Title: Phylogenetic analysis of the evolution of display behavior in the neotropical manakins (Aves: Pipridae) One of the most difficult issues related to bird evolution is the evolution of feathers.
Feathers are complex, designed structures required for flight, and are today found only on birds.
The origin of birds has always been a major problem for Darwinism, and even today little agreement about the. The Origin and Evolution of Feathers Coherent scattering of ultraviolet light by avian feather barbs A Fourier tool for the analysis of coherent light scattering by bio-optical nanostructures.
The origin of birds. probably evolved the first feathers. These short, hair-like feathers grew on their heads, necks, and bodies and provided insulation. The feathers seem to have had different color patterns as well, although whether these were for display, camouflage, species recognition, or another function is difficult to tell.
The specimen shows distribution of large pennaceous feathers on the forelimbs and tail, implying that pennaceous feathers spread to the rest of the body at an earlier stage in theropod evolution.
The discovery, inof feathers preserved in amber, within samples dating to 80 mya, suggests the coexistence of theropods and birds, with both .A short analysis of the evolution of feathers