A new study has found that North American migratory birds have been getting smaller over the past 40 years. Researchers say the finding suggests a warming climate could be affecting bird growth in North America, and across the world. The study was recently published in Ecology Letters. It involved data on nearly 80,000 birds killed from 1978 to 2016 in the city of Chicago, Illinois. Researchers measured the size of the birds. The birds included in the study had died after crashing into buildings during the spring and fall migrations. Fifty-two species of birds were studied. Most were different kinds of songbirds. These birds reproduce in cold areas of North America and spend their winters in areas south of Chicago. Over the 40-year period, body size decreased in all 52 species.
Title: Climate Change May Be Causing Smaller American Birds
Content: <div id='article-page'><div id='article-content' data-media-url='//news-app-staging.s3.amazonaws.com' data-base-url='//news-app-staging.herokuapp.com' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3821/birds.wav' data-capture-url='//staging.analytics.lingraphica.com/events/capture_news' data-article-title='Climate Change May Be Causing Smaller American Birds' data-article-id='4363'><script src='//news-app-staging.herokuapp.com/javascripts/getscripts.js'></script><link rel='stylesheet' href='//news-app-staging.herokuapp.com/stylesheets/article.css' type='text/css' /><div class='article'><p><span data-start-time='0' data-end-time='11583'>A new study has found that North American migratory birds have been getting smaller over the past 40 years.</span> <span data-start-time='11583' data-end-time='24875'>Researchers say the finding suggests a warming climate could be affecting bird growth in North America, and across the world.</span> <span data-start-time='24875' data-end-time='30854'>The study was recently published in Ecology Letters.</span> <span data-start-time='30854' data-end-time='44063'>It involved data on nearly 80,000 birds killed from 1978 to 2016 in the city of Chicago, Illinois.</span> <span data-start-time='44063' data-end-time='48750'>Researchers measured the size of the birds.</span> <span data-start-time='48750' data-end-time='59521'>The birds included in the study had died after crashing into buildings during the spring and fall migrations.</span> <span data-start-time='59521' data-end-time='63938'>Fifty-two species of birds were studied.</span> <span data-start-time='63938' data-end-time='68104'>Most were different kinds of songbirds.</span> <span data-start-time='68104' data-end-time='78750'>These birds reproduce in cold areas of North America and spend their winters in areas south of Chicago.</span> <span data-start-time='78750' data-end-time='86063'>Over the 40-year period, body size decreased in all 52 species.</span> </p></div><div class='control-buttons-sticky' style='display:none;'><div class='control-buttons'><button title='Back' class='back' disabled='disabled'></button><button title='Play' class='play' disabled='disabled'></button><button title='Pause' class='pause' style='display:none;'></button><button title='Forward' class='forward' disabled='disabled'></button><button class='finished-reading' style='display:none;'>Done</button></div></div></div><div id='article-media'><div id='media-image'><img src='https://news-app-production.s3.amazonaws.com/articles/3821/birds.jpg'/></div></div><div id='question-content' style='display:none;'><div class='vocabulary_question question-container' data-question-id=14166 data-hint-location='24875' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3821/what_does_ecology_mean.wav'>What does ecology mean?</div><div class='choices' data-correct-choice='the study of living things'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3821/climate_change_science.wav'><span>climate change science</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3821/different_kinds_of_birds.wav'><span>different kinds of birds</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3821/the_study_of_living_things.wav'><span>the study of living things</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3821/go_south_for_the_winter.wav'><span>go south for the winter</span></div></div></div><div class='multiple_choice_question question-container' data-question-id=14167 data-hint-location='48750' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3821/how_did_the_birds_die.wav'>How did the birds die?</div><div class='choices' data-correct-choice='they crashed into buildings'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3821/the_climate_killed_them.wav'><span>the climate killed them</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3821/they_crashed_into_buildings.wav'><span>they crashed into buildings</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3821/their_body_size_increased.wav'><span>their body size increased</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3821/they_lived_in_chigaco.wav'><span>they lived in Chigaco</span></div></div></div><div class='sentence_completion_question question-container' data-question-id=14168 data-hint-location='0' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3821/birds_have_been_getting__blank_.wav'>Birds have been getting <span class='blank'>smaller</span>.</div><div class='choices' data-correct-choice='smaller'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3821/smaller.wav'><span>smaller</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3821/larger.wav'><span>larger</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3821/colder.wav'><span>colder</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3821/measured.wav'><span>measured</span></div></div></div><div class='question-buttons'><button class='skip-button'></button><button class='hint-button'></button><button class='speak-button'></button></div></div></div>
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