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U. S. NATIONAL MUSEUM BULLETIN 133 PL. 15 Two Nests'of the Hornero, or Ovenbird (Furnarius r. rufus), on Face of Clay Bank. Note That One Is Entered from the Right and the Other from the Left La Paloma, Uruguay, January 23, 1921 Hornero, or Ovenbird (Furnarius r. rufus), and Nest ON Side of Palm San Vicente, Uruguay, January 27, 1921
BIRDS OF AEGENTINA, PAEAGUAY, URUGUAY, AND CHILE 247 Though normally nests were placed on more or less horizontal limbs of trees, the birds were so abundant that almost any available site was utilized. Cross arms on telegraph poles were favored situations, while many of the mud structures were placed on the summits of poles. Through eastern Buenos Aires I recorded dozens of nests set as capstones on the tops of fence posts; any irregularityon the top of the post was filled in with mud and the nest, placed on the platform thus made, formed an ornamental ball that capped the pillar. Man}' nests were perched on the roofs of houses or on cornices. On one occasion I noted on a house with a gable roof two ovenbirds' nests placed one at either end at the very summit of the gables, where they resembled ornaments as symmetrically placed as though by the hands of the human occupants of the dwellings. On the coast of southern Uruguay, near La Paloma, ovenbirds som.e- times placed their homes on projecting points on the abrupt faces of clay banks that bounded deep cut arroyos, where the rounded nests, perched like the structures of ancient cliff dwellers, were practically inaccessible. As they were built of the same clay as the banks on which they rested, they were almost indistinguishable save when shadows threw the openings into relief. Farther to the eastward, in Uruguay, it was usual to see nests stuck on the sides of palm trunks, where some slight roughness or projection offered support. As the nests were plainly visible the birds made no point of stealth in visiting them; frequently if one stopped to look up at a nest the owner came down to rest upon the top of it. Ernest Gibson many years ago commented upon the fact that in eastern Buenos Aires the nest of the harnero^ as the ovenbird is known, liad the opening invariably at the left side. I was interested in observing ' that birds in tliat region adhere to the same custom to-day, as in considerably more than 200 nests that I saw in the region of Dolores, Lavalle, and Santo Domingo all had the entrance at the left. In Uruguay and elsewhere right or left hand openings were made without evident choice. On one occasion in passing from Rocha to La Paloma I had opportunity to see about 100 of these ovens and found that they were more or less evenly divided as to position of the entrance. As the nests are durable they last for more than one year, so that old ones are available for use of other birds. The band- breasted martin, Phaeoprogne tapera, appeared to choose these for nesting sites, and at times may have attempted to oust ovenbirds from domiciles still in use, as I recorded squabbles between the two species over the possession of ovens. (Pis. 14 and 15.) The eggs of the hornero are white, without gloss, and with the shell somewhat roughened. In many cases the eggs are covered with mud. At Lavalle, Buenos Aires, on October 30, 1920, in one
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ADVERTISEMENT The scientific public
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IV TABLE OF CONTENTS Annotated list
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BIRDS OF ARGENTINA, PARAGUAY, URUGU
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BIRDS OF AKGENTINA, PARAGUAY, URUGU
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BIKDS OF ARGENTINA, PARAGUAY, URUGU
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BIEDS OF ARGENTINA, PARAGUAY, URUGU
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BIEDS OF AEGENTINA, PARAGUAY, URUGU
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BIRDS OF AKGENTINA, PARAGUAY, URUGU
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BIEDS OF ARGENTINA, PARAGUAY, URUGU
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INDEX Page a. bivittatus, Lepidocol
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cactorum, Trichopicus INDEX 437 Pag
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INDEX 439 Page Page defllippii, Tri
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INDEX 441 Page immaculata, Phaeopro
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INDEX 443 Page Myospiza humeralis c
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INDEX 445 Page Pseudoseisura guttur
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INDEX 447 Page Sublegatus fasciatus
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SMITHSONIAN INSTfTUTION LIBRARIES 3
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