Why do birds migrate?
To find resources
To find food
To find nesting
To run away from danger
What RESOURCES do birds in the northern hemisphere gain by flying south in the winter and north in the spring?
Less crowded areas
Growing insect populations
What is a FLYWAY?
The way birds organize themselves as they fly south
The path a bird takes during migration (migration corridor)
A special form of flying where birds move up and down quickly during migration
A word meaning "running away from predators"
Migrating birds can cover thousands of miles in their annual travels.
Most migrating birds choose a completely different path every year.
First year birds may migrate to a winter home they have never seen and return the following spring to the area in which they were born
What are some techniques migrating birds use to navigate?
Some birds use the stars to navigate
Some use sense of hearing to try to hear which routes are the safest
Some sense changes in the earth's magnetic field
The secrets of birds' amazing navigational skills remain largely hidden.
Some use sense of smell
What hazards do birds face during migration?
MAN-MADE STRUCTURES - Radio/TV/cell towers that attract birds to the light, and collisions with glass
SUN - Birds often get too heated by the sun
WEATHER - can blow birds off course or kill them directly
TIMING - arriving early can lead to freezing or lack of food and a late spring can lead to starvation.
BOREDOM - birds often get bored and distracted when migrating
PREDATORS - Hawks, falcons, and domesticated cats
Which bird travels the greatest distance during migration
Red Tailed Hawk
The Arctic Tern
How many miles can it travel each year?
How many miles can it fly during it's LIFETIME?
more than 800,000 miles
more than 1 million miles
more than 20,000 miles
more than 1,000 miles
Owls are birds of ___________________.
What are some characteristics of birds of prey?
Sharp, curved beak and talons
Very large heads
What do the fringed feathers on owls enable them to do?
Shield themselves from rocks and sharp objects
Owls have small eyes on the front of their heads
Because owl eyes are fixed, they can rotate their head to see behind them
Some owls use sonar to locate prey
What are places where owls ARE NOT found living?
The United States
parts of Greenland
some remote islands
What is the PROVENTRICULUS?
The part of the owl where other wastes are excreted
The second part of the stomach that acts as a filter for indigestible items.
The first part of the stomach that contains enzymes and acids that digest food.
What is the VENTRICULUS
The part of the owl where other wastes (other than pellets) are excreted
What type of vision do owls have?
Excellent near-sighted vision
Excellent far-sighted vision
How many degrees in either direction can owls move their necks?
How many degrees vertically can owls move their necks?
Why do owls have large eyes?
To prevent them from getting eye diseases
To help them see better at night by taking in more light
To scare away large predators
How many eyelids do owls have?
What are 3 things owls use their eyelids for?
Upper lid - for blinking
Upper lid - for sharpening their vision
Lower lid - for sleeping
Nictating Membrane - for cleaning and protecting surface of the eye