Presentation on theme: "Evolution of Birds from Reptiles"— Presentation transcript:
1Evolution of Birds from Reptiles SZ2- Students will explain the evolutionary history of animals over the geological history of Earth.Evolved from reptiles-Few intermediate fossils due to lack of preservation of feathers or thin, hollow bones
10Archaeopteryx Possible link between birds & reptiles (150 mya) Reptilian char-Large skull, reptile like teethBones solidClaws on forelimbsLong tailBird Char.-Strong legs & rounded wings for glidingFeathersFurculum - fused collarbone or wishbone
11Hesperonis Fossils 75 mya Large, flightless bird Had teeth like reptiles
12Ichthyornis Smaller, tern like bird Lived 65-80 mya Had large flight wings
13Kingdom Animalia Phylum Chordata Class Aves-birds Traits: Air sacs/hollow bones make bird lighterfeathers4 chambered heartendothermicBeaks and feet adapted for food and habitatEvolved from dinosaurs in Mesozoic eraScales on legs- similar to reptiles
14General Bird AnatomySZ4- Students will assess how animals interact with their environment including key adaptation found within animal taxa.
16Metabolic Adaptations Birds have high metabolismEndothermic, 4 chambered heartLungs, air sacs for increasedoxygen avail.Crop and gizzard(grinds food) in digestive tractMetanephric kidney excretes uric acid- prevents water lossCounter-current circulation
30Avian Reproduction Amniotic egg Internal fertilization Oviparous- eggs laidoutside of bodyBoth parents care for eggsPrecocial young- active at hatchingAltricial young- helpless and naked at hatchingmigration
40Pop QuizList three adaptations that allow birds to have a high metabolism.List three adaptations that allow birds to fly.What type of egg does a bird have?What is the name of the class the bird belongs to?
41Avian Classification 28 orders 9600 species SZ1- Students will derive the phylogeny of animal taxa using informative characteristicsSZ3- Students will compare form and function relationships within animal groups and across key taxa.
43Paleognathae- Order Struthioniformes Large flightless birdTwo toesOld jawEx. ostriches
44Neognathae- Order Pelecaniformes Pelicans, cormorants, boobies
45Neo- Order Ciconiiformes Long legs for wadingLong necksPink or orange because of carotenoids in algae and brine shrimp that eat algaeLiver enzymes break down the carotenoids into pink and orange pigments that are deposited into feathers, bill, and legs