answer stringlengths 1 239 ⌀ | question stringlengths 1 25.7k |
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44% | In Australia, what percent of non-passerine birds are partially migratory? |
32% | In Australia, what percent of passerine species are partially migratory? |
birds that nest at higher latitudes spend the winter at lower latitudes | What is leap frog migration? |
Female | Which sex of the chaffinches Fringilla coelebs migrate earlier? |
Eastern Fennoscandia | Where are chaffinches Fringilla coelebs from? |
autumn | When do the chaffinches Fringilla coelebs migrate? |
the birds starting off in a broad front | How do most migrations begin? |
mountain ranges or coastlines | What to the migrating birds usually follow? |
large stretches of open water | What obsticals will migrating birds avoid? |
clockwise | What is a common pattern in North America migration? |
flyways | What are the preferred routes for migration called? |
in flocks | How do most birds migrate? |
12–20% | How much energy do geese conserve flying in a flock? |
3.1 mph | How much faster do Red knots and dunlins fly in a flock? |
energy cost | What does flying in flocks reduce? |
a V-formation | How do birds conserve energy? |
skeletons | What part of birds was found on an expedition to Mt. Everest? |
Bar-headed geese Anser indicus | Which birds have the highest rates of climb to altitude? |
Seabirds | What kind of birds fly low over water? |
150 to 600 m | What altitude range is most migration recorded? |
below 600 m | Where do most in air collisions occur? |
by swimming | How do penguins migrate? |
over 1,000 km | How far do penguins travel when they migrate? |
mostly by walking | How do Dusky grouse migrate? |
on foot | How do Emus migrate long distances during droughts? |
Australia | Where are Emus from? |
from Iceland to Britain | Where do the pink-footed goose migrate? |
arctic climates to the contiguous United States | Where do the dark-eyed junco migrate? |
Asia and Europe | Where do the European pied flycatcher breed? |
Africa | Where does the European pied flycatcher spend the winter? |
during their first migration with their parents | How do young learn migratory routes? |
an hooked or arched line | What route does a migrating bird usually follow? |
large water bodies or high mountain ranges | What geographical barriers to land birds try to avoid? |
the lack of stopover or feeding sites | Why do migrating land birds avoid large water bodies or mountain ranges? |
lack of thermal columns | Why do broad winged birds avoid geographical barriers? |
a large area of land without bodies of water | What do water birds avoid while migrating? |
the Taymyr Peninsula | Where do brent geese migrate from? |
the Wadden Sea | Where do brent geese migrate to? |
via the White Sea coast and the Baltic Sea | How do brent geese migrate? |
shorebirds | What are waders called in North America? |
warmer locations in the same hemisphere | Where do dunlin Calidris alpina migrate to? |
the tropics in the Southern Hemisphere | Where do semiplamated sandpiper C. pusilla migrate to? |
Arctic breeding grounds | Where do western sandpiper Calidris migrate from? |
the availability of certain key food resources | What does successful migration depend on for some waders? |
stopover points along the migration route | Where do migrants refuel? |
the Bay of Fundy | Where is an important stopover location? |
Delaware Bay | What is another stopover location? |
bar-tailed godwits | Which bird has the longest migration? |
11,000 km | How far do bar-tailed godwits travel to migrate? |
Alaska | Where do bar-tailed godwits migrate from |
New Zealand | Where do bar-tailed godwits migrate to? |
55 percent | How much of the bar-tailed godwits bodyweight is stored as fat before migration? |
The Arctic tern | Which seabird has the longest-distance migration? |
The Arctic tern | Which bird sees more daylight than any other during migration? |
three months | How long did one Arctic tern take to migrate? |
22,000 km | How far did the Arctic tern chick travel? |
the southern hemisphere | Where do tubenosed birds breed? |
pelagic | Which species are great wanderers? |
8 million km | How far did a Manx shearwater fly over it's lifespan? |
Manx shearwater | Which bird broke a record in how far it flew over it's life? |
50 year | How long did the Manx shearwater live? |
14,000 km | How far will Puffinus griseus migrate each year? |
thermal columns of rising hot air | What do some large broad-winged birds rely on to help them soar? |
daytime | When do large birds of pray migrate? |
Batumi bottleneck | What is one of the heaviest migratory funnels? |
10 to 20% | How much of their body weight do honey buzzards lose during migration? |
hundreds of thousands | How many birds funnel through Batumi, Georgia each year? |
usually at night | When do many insectivorous birds migrate? |
smaller insectivorous birds | Which kinds of birds land for a few days before resuming migration? |
passage migrants | What are smaller insectivorous birds referred to? |
a few days | How long do passage migrants stop and feed before resuming migration? |
minimize predation | What is a benefit of nocturnal migration? |
loss of sleep | What is a cost of nocturnal migration? |
Migrants may be able to alter their quality of sleep | How do nocturnal migrants compensate for loss of sleep? |
avoid overheating | What is another benefit of nocturnal migration? |
respond to changing day length | What are many long distance migrants genetically programmed to do? |
response to local weather conditions | How do species that move short distances know when to migrate? |
to escape the cold higher ground | Why do mountain and moorland breeders move only altitudinally? |
the coast or towards the south | Where do the merlin Falco columbarius migrate to? |
5 km | How far do British chaffinch more in their lives? |
two | How many evolutionary origins do short distance passerine migrants have? |
the common chiffchaff Phylloscopus collybita | Which species have long-distance migrants in the same family? |
to stay in the northern hemisphere | Why have some specied progressively shortened their return migration? |
the waxwings Bombycilla | What species has no long-distance migratory relatives? |
winter weather and the loss of their usual winter food | What are the waxwings Bombycilla moving in response to? |
enhanced breeding opportunities | Why are the waxwing Bombycilla not migrating for? |
In the tropics | Where is there little variation in the length of day throughout the year? |
to obtain more of their preferred foods | Why does altitudinal migration occur in some tropical birds? |
fruits | What are tropical birds preferred foods? |
In the tropics | Where is it always warm enough for food supply? |
a good breeding season followed by a food source failure | For what reason would birds mor far beyond the normal range? |
five | How many times did Bohemian waxwings come to Britain in the nineteeth century? |
18 | How many times did Bohemian waxwings come to Britain between 1937 and 200? |
1251, 1593, 1757, and 1791 | What years did Red crossbills invade England? |
Northern | In which hemisphere does bird migration primarily happen? |
south | Where do birds from high northern latitutes migrate to? |
food becomes scarce | Why do birds migrate south in winter? |
species of the Southern Hemisphere | Which species of seabirds are more likely to migrate? |
there is a large area of ocean in the Southern Hemisphere | Why are seabirds from the southern hemisphere more likely to migrate? |
a primitive trait | What controls a birds migration? |
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