Migration Flashcards
Migration allows animals to ___.
Avoid winter all together.
Why do these animals migrate? Give an example.
Food shortage.
Songbirds and Sandpipers feed in the ground when the ground freezes they can’t do this.
Name some species that migrate. (6)
Red Bats Common Green Darner Songbirds Sandpiper Red Knots Arctic Tern
What do these animals do before they leave? How much fat and what does this depend on?
Fatten up to gain Subcutaneous fat to use as fuel.
Songbirds add 10% to their weight. (shorter distance)
Sandpipers double their body weight in 10 days. (long distance)
Night time migration is good why? Give example of bird.
Fewer threats, cooler temperatures (cools the engine), and calmer winds. Songbirds.
Daytime migration is good for certain birds why? Give bird examples.
Thermals are pockets of air that are stronger during the day and Vultures and Eagles use this to fly. Thermal hopping and riding air currents requires 0 energy.
Some birds feed as they fly -> hummingbirds and swallows
What is thermal hopping?`
What vultures and eagles use to fly.
They soar up on thermals and then glide down on thermals. Sunshine creates thermals.
What is a physical adaptation for thermal hopping?
Slotted wing feathers for extra lift and large wings.
When do Sandpipers migrate?
Day and night because of such long distances.
How do birds know when to migrate?
The days get shorter.
Name the daytime migration visual cues.
The sun, landforms and other visual cues.
Name the nighttime visual cues.
Moonlight and constellations.
What do both daytime and nighttime migrators use to navigate?
The earths magnetic field
What helps bids interact with the Earths Magnetic Field.
Rhosophsin a retinal photopigment
Why do Canada Geese fly in a V?
Free lift to conserve energy.
Define Banding
bird migration tracking by tagging coloured bands with numbers on birds for tracking
How do they catch birds for banding?
Mist nets
Define Geolocators
Radio transmitters that capture tagged birds signal when it is close to it.
What is the most advanced tracking system for birds atm.
Motus with nanotags. Complete hemispheric tracking and the nanotags release the signal to the motus.
Disadvantages of migration. (4)
Storms (esp. with climate change)
Urban Expansion
Habitat loss
Only 1/2 the birds that migrate return
