What features of the bird’s digestive system are associated with its ability to fly?

The main feature associated with the fact that a bird needs to have a minimum mass for flight is that birds have a “through” digestive system, i.e. The digestive system of a bird is a hollow tube from the beak to the cloaca. The system works on the trail. principle: it takes feed, produces juice with enzymes, absorbs substances and removes undigested residues through the cloaca. If it is a bird of prey, then bones, claws and hard objects, they vomit.

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.

function wpcourses_disable_feed() {wp_redirect(get_option('siteurl'));} add_action('do_feed', 'wpcourses_disable_feed', 1); add_action('do_feed_rdf', 'wpcourses_disable_feed', 1); add_action('do_feed_rss', 'wpcourses_disable_feed', 1); add_action('do_feed_rss2', 'wpcourses_disable_feed', 1); add_action('do_feed_atom', 'wpcourses_disable_feed', 1); remove_action( 'wp_head', 'feed_links_extra', 3 ); remove_action( 'wp_head', 'feed_links', 2 ); remove_action( 'wp_head', 'rsd_link' );