aim: what are the main characteristics of birds and how are they adapted for flight? obj: given...
TRANSCRIPT
Aim: What are the main characteristics of birds and how are they adapted for flight?
OBJ: Given activity sheet SWBAT explain the main characteristics of birds and how are they adapted for flight with 70% accuracy.
DN: HW check – Reptiles Act. Sheet
ACT: Introduction to Birds (notes)Text, read p. 118-124, Work on Birds Activity Sheet
HW: Complete Birds Activity Sheet; Quiz soon !!!; Work on Vertebrate Review Sheets and Animal Activity Sheet, Vertebrate Exam, Dec. 3
Bird Characteristicsendothermic: warm blooded (maintain constant body
temperature by food and feathers)
feathers
air sacs
First 4 chamber heart (prevents mixing of O2 rich and O2 poor
blood)
eggs (hard shell)
“care for young” behavior (feed & protect until young able to fly)
internal fertilization
Adaptation for Flighthollow bones
wings
large chest muscles
feathers (2 types):
contour feathers- steering & flight
down feathers- trap heat & warmth
air sacs- connected to lungs to obtain more oxygen
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Bird FlightBird’s upward curved wing causes faster moving air above wing (= lower pressure) and slower moving air below wing (= higher pressure). As the bird moves through the air, the high to low pressure results in an upward force called lift. Lift results in flight.
Bird’s Adaptation for Flight
Hollow Bones
High Pressure
High Pressure
Low Pressure
Low Pressure
Lift
Obtaining FoodBills – tear, strainer
Crop - internal storage tank
Two part stomach:
Part 1: chemical breakdown
Part 2: gizzard- physical breakdown with stones (gastroliths)
Bird Anatomy
Role of Birds in the EnvironmentMost diverse vertebrate group. Their role: pollinators disperse seeds pest predators
Origin of the Birds:Birds are believed to be descended from Archaeopteryx (a reptilian dinosaur with wings and feathers)
Bird Origins
dinosaurs
dinosaur w/ bird features
bird
Birds with teeth
Birds with teeth
Dinosaur Eggs
Gastroliths
Gastroliths
So, when eating your turkey this Thanksgiving, just remember you are eating a dino descendant. Enjoy !!!