LLW015 1963 Aimophila humeralis August 8 7 am, S. Parrla, Puebla, Mexico at least 1/2 hour. Followed this pair across open area to trees/shrubs along stream valley after seeing juveral plumaged bird [illegible] begging from chest. Or sat up in exposed perch giving occasional tzrip note while I foraged on ground. Foraged across open area where grass - 1/2-1/2 inches tall, then to edge of tall grass + small shrubs. Sometimes fluttered up a little to hop across tall grass. Saw butterfly up + snapped white moth she had flushed from grass. Missed + flew after moth finally caught it in grass then disappeared into or behind some thick ground vegetation. Began to hear softer + higher tzrip - like notes from near ground in trees/area where I had been foraging. As I approached young fledgels across stream bed + into thick tangle of shrubs + fallen tree limbs. Collected both parents + flushed young into exposed perch on legume branch where collected it. This was first time except when first seen that young was not hidden in dense vegetation. When first seen I had been watching & foraged & lost both birds as they went uphill. When I followed they both flushed into exposed perches near top of 15 foot tree. Both then began preening vigorously. This lasted 5+ minutes until first heard call note of young. It then hopped into view about 12 inches above ground +