The enzymes that act inside the small intestine are amylase, protease, and lipase. Amylase acts on starch and breaks it down into small carbohydrate molecules. Protease acts on proteins and breaks them down into amino acids. Lipase breaks down dietary fats into smaller molecules called fatty acids and glycerol.
Sandhill Cranes mate for life, choosing their partners based on dancing displays. Displaying birds stretch their wings, pump their heads, bow, and leap into the air. Although each female usually lays two eggs, only one nestling typically survives to fledge.
A Screech Owl will find a new mate if one of the pair dies. It has been reported that male Screech Owls will on occasion form pair bonds with a second female in good habitat with abundant prey.reedingPairs of screech owls mate for life after a somewhat elaborate courtship that involves the male swiveling his head, bobbing his body up and down and winking his eyes. If the female appreciates his efforts she moves close, they touch bills, and mutual preening ensues.