what does the above species feed on?
Large flies make up 70% of their diet. The normally pick their prey from the water surface, walls and plants.
Barn swallow
The barn swallow typically feeds in open areas above shallow water or the ground often following animals, humans or farm machinery to catch disturbed insects, but it will occasionally pick prey items from the water surface, walls and plants. In the breeding areas, large flies make up around 70% of the diet, with aphids also a significant component.
when do birds start flying south for the winter It a regular seasonal movement, often north and south, undertaken in response to changes in food availability, habitat, or weather.  The most common pattern involves flying north in the spring to breed in the temperate or Arctic summer and returning in the autumn to wintering grounds in warmer regions to the south. can you name some of these migratory species? Swallows, wildfowl, the pink-footed goose and finch are some of them. how do these species navigate to a certain area? Navigation is based on a variety of senses. Many birds have been shown to use a sun compass. Some also use a combination of skills like, the ability to detect magnetic fields or use visual landmarks as well as olfactory cues. can you give me an example of how the studies were carried out for their migration? Some of the techniques include, marking the specie, radar and satellite tracking. what are the threats these species face during migration? Since their travel involves crossing political boundaries of countries, it can put species at risk if any convservation measure is not put in place. Many spectacular migrants have already gone extinct due to this. can you name a few birds who migrate in the night? UNANSWERABLE earlier you had mentioned some migratory species, in which country/region is the first species commonly found? Europe, Africa and Northern America region. which family do they belong to as per the scientific classification? Passerine birds. can you name some specific species of that first migratory bird which you mentioned earlier? Barn Swallow
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Barn swallow [SEP] Feeding
The barn swallow is similar in its habits to other aerial insectivores, including other swallow species and the unrelated swifts. It is not a particularly fast flier, with a speed estimated at about , up to and a wing beat rate of approximately 5, up to 7–9 times each second. The barn swallow typically feeds in open areas above shallow water or the ground often following animals, humans or farm machinery to catch disturbed insects, but it will occasionally pick prey items from the water surface, walls and plants. In the breeding areas, large flies make up around 70% of the diet, with aphids also a significant component.