Stock photography image - The primary motivation for migration appears to be food

Bird migration is the regular seasonal journey undertaken by many species of birds. Bird movements include those made in response to changes in food availability, habitat, or weather. Sometimes, journeys are not termed “true migration” because they are irregular (nomadism, invasions, irruptions) or in only one direction (dispersal, movement of young away from natal area). Migration is marked by its annual seasonality.
Many bird populations migrate long distances along a flyway. 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. Of course, in the Southern Hemisphere the directions are reversed, but there is less land area in the far South to support long-distance migration.

The primary motivation for migration appears to be food; for example, some hummingbirds choose not to migrate if fed through the winter. Also, the longer days of the northern summer provide extended time for breeding birds to feed their young. This helps diurnal birds to produce larger clutches than related non-migratory species that remain in the tropics. As the days shorten in autumn, the birds return to warmer regions where the available food supply varies little with the season.

 

 

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The primary motivation for migration appears to be food

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Image ID: 18075
License type: Rights Managed (RM)
Contributor: Hamim CHOWDHURY
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Keywords: , , , , , ,
Categories: Animals And Pets, Landscapes, Nature, Objects
Location: Baikka Bill, Srimongol, sylhet, Bangladesh
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Stock photography image - Buffet food item in an expensive local restaurant Buffet food item in an expensive local restaurant
Buffet restaurants are found only in rich areas in the main cities mainly in the capital city Dhaka. Buffet lunches and dinners are one of the most expensive food arrangements in the city. So, there are only a handful of buffet restaurants in the largest cities.
Categories: Food And Drink
Keywords: buffet, delicious, dinner, expensive, Food, item, items, Lunch, Restaurant, rich, spicy, tasty
Location: Dhaka, Bangladesh
Price (Small XS): $10.
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Stock photography image - Buffet food item in an expensive local restaurant Buffet food item in an expensive local restaurant
Buffet restaurants are found only in rich areas in the main cities mainly in the capital city Dhaka. Buffet lunches and dinners are one of the most expensive food arrangements in the city. So, there are only a handful of buffet restaurants in the largest cities.
Categories: Food And Drink
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Stock photography image - Birds are free and can fly so they migrate themselves Birds are free and can fly so they migrate themselves
Most birds can fly, which distinguishes them from almost all other vertebrate classes. Flight is the primary means of locomotion for most bird species and is used for breeding, feeding, and predator avoidance and escape. Birds have various adaptations for flight, including a lightweight skeleton, two large flight muscles, the pectoralis (which accounts for 15% of the total mass of the bird) and the supracoracoideus, as well as a modified forelimb (wing) that serves as an Aeroflot. Wing shape and size generally determine a bird species' type of flight; many birds combine powered, flapping flight with less energy-intensive soaring flight. About 60 extant bird species are flightless, as were many extinct birds. Flight less ness often arises in birds on isolated islands, probably due to limited resources and the absence of land predators. Though flightless, penguins use similar musculature and movements to "fly" through the water, as do auks, shear waters and dippers. Bird migration is the regular seasonal journey undertaken by many species of birds. Bird movements include those made in response to changes in food availability, habitat, or weather. Sometimes, journeys are not termed "true migration" because they are irregular (nomadism, invasions, irruptions) or in only one direction (dispersal, movement of young away from natal area). Migration is marked by its annual seasonality.
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Stock photography image - Bird migration is the regular seasonal journey undertaken by many species of birds Bird migration is the regular seasonal journey undertaken by many species of birds
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Stock photography image - Bird migration is the regular seasonal journey undertaken by many species of birds Bird migration is the regular seasonal journey undertaken by many species of birds
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Many bird populations migrate long distances along a flyway. 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. Of course, in the Southern Hemisphere the directions are reversed, but there is less land area in the far South to support long-distance migration. The primary motivation for migration appears to be food; for example, some hummingbirds choose not to migrate if fed through the winter. Also, the longer days of the northern summer provide extended time for breeding birds to feed their young. This helps diurnal birds to produce larger clutches than related non-migratory species that remain in the tropics. As the days shorten in autumn, the birds return to warmer regions where the available food supply varies little with the season. These advantages offset the high stress, physical exertion costs, and other risks of the migration such as predation. Predation can be heightened during migration: the Eleonora's Falcon, which breeds on Mediterranean islands, has a very late breeding season, coordinated with the autumn passage of southbound passerine migrants, which it feeds to its young. A similar strategy is adopted by the Greater Noctule bat, which preys on nocturnal passerine migrants. The higher concentrations of migrating birds at stopover sites make them prone to parasites and pathogens, which require a heightened immune response.
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Stock photography image - Two duck just taking off to fly, Two duck just taking off to fly,
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