Shiny Cowbird in Rufous Hornero Nest

Rufous Horneros were a common species of ovenbird around Buenos Aires, Argentina. One sees their clay oven nests on top of many utility poles and other structures. They make a new nest every year, whether they need one or not. Sometimes, they will build a new nest on top of the old one. Other birds use the nests in subsequent years. At Otamendi, we saw a hornero nest that had a young Shiny Cowbird at the entrance.

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