Birds Vertebrate Zoology. Thecodontosaurus Thecodontosaurus.
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Transcript of Birds Vertebrate Zoology. Thecodontosaurus Thecodontosaurus.
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BirdsBirds
Vertebrate Zoology
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ThecodontosaurusThecodontosaurus
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ThecodontosaurusThecodontosaurus
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IguanodonIguanodon
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IngeniaIngenia
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IncisivosaurusIncisivosaurus
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ArchyopteryxArchyopteryx
150 mya
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ArchaeopteryxArchaeopteryx• Possible link between birds & reptiles
• Large skull with reptile like teeth
• Bones not hollow
• Claws on forelimbs
• Long tail
• Strong legs & rounded wings for gliding
• Feathers
• Furculum - fused collarbone or wishbone
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HesperonisHesperonis
Fossils 75 mya• Large, flightless
bird• Had teeth like
reptiles
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IchthyornisIchthyornis
• Smaller, tern like bird
• Lived 65-80 mya• Had large flight
wings
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Evolution of BirdsEvolution of Birds
• Evolved from reptiles
• Few fossils due to lack of preservation of feathers or thin, hollow bones
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Bird CharacteristicsBird Characteristics
• Endothermic• Feathers = modified scales• Pectoral appendages = wings• Pelvic appendages = feet• Crop & gizzard• Air sacs & lungs• Counter-current circulation• Uric Acid excretion• Sexual reproduction
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Characteristics pg 2Characteristics pg 2
• Feathers made of protein called keratin• Thin, hollow bones; some bones fused for extra
strength• Scales on legs• Toothless, horny beak• Additional air sacs with lungs for more oxygen• Four chambered heart• Amniotic egg with calcium carbonate shell• Oviparity with both parents often caring for
eggs
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EndothermicEndothermic• Warm blooded
• Ability to generate heat & maintain a constant body temperature
• Can live in hot or cold climates
• Requires more food
• Requires faster body processes to generate heat
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FeathersFeathersUsed in many ways• Flight
• Regulation of body temperature (thermoregulation)
• Protection of the body
• Attraction of mates
• Identification of species
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FeathersFeathers
• Modified scales
• Provide lift for flight & help conserve body heat
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Types of FeathersTypes of Feathers• Contour feathers
cover the body of a bird and have a strong, hollow shaft and network of hooks.
• Down feathers are small and are located under the contour feathers to insulate the bird from the cold.
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Feather AnatomyFeather Anatomy
• Rachis – stiff “backbone” of feather
• Barb – branch off of rachis
• Barbule – connect barbs
• Calamus = Quill
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Contour FeathersContour Feathers
• Flight feathers = remiges
• Tail feathers = retrices • Act as brakes and a rudder• Most birds have 12 tail feathers
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Contour FeatherContour Feather
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Lacking Barbules in Owl Lacking Barbules in Owl Feathers = Quiet FlightFeathers = Quiet Flight
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PreeningPreening
• A bird spends part of each day making minor repairs to tears in its feathers
• Feathers are re-zipped
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Preening Zips the FeathersPreening Zips the FeathersBefore After
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Feather GrowthFeather Growth
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Down FeathersDown Feathers
• Soft & fluffy
• Cover the body of nestlings
• Provide an undercoat insulating adult bird
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FiloplumesFiloplumes
• Called pin feathers
• Hairlike feathers under contour feathers on body
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WingsWings
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Flight ForcesFlight Forces
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Bernoulli’s PrincipleBernoulli’s Principle
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Keeled Sternum and Keeled Sternum and FurculumFurculum
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Thermals & Air CurrentsThermals & Air Currents
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Feet Feet
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Digestion – Digestion – Crop & GizzardCrop & Gizzard
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Woodpecker & Woodpecker & Honeycreeper TonguesHoneycreeper Tongues
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RespirationRespiration
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Counter-Current Counter-Current CirculationCirculation
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Excretion – Uric AcidExcretion – Uric Acid• Uric acid
metabolic excretion
• (Saves water)• Urea• Ammonia
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Reproduction Reproduction
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CloacaCloaca
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Starling NestsStarling Nests
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Weaver Bird NestWeaver Bird Nest
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Brood ParasitismBrood Parasitism
Cardinal or Cowbird eggs?
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MigrationMigration
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Bird BrainsBird Brains
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