My 8 month old healthy-looking extremely active, happy and fun leghorn hen sometimes has an attack of the yawns. Then it goes away. Its not every day. It seems to happen after I let her have crickets and worms and then chill inside in the warm home entryway to relax. Thats when she sometimes will yawn like 20 times in a row, stretching her neck out. Then it goes away and she resumes her happy little routine. Is this normal? Or is it always gapeworms? I watched heartbreaking vids of hens that looked sick and listless from gapeworms. my little leghorn doesnt look sick. Thanks.