Riverside Wrens (Thryothorus semibadius) love the underbrush. The area around Manuel Antonio (Costa Rica) is full of Riverside Wrens. They have several distinct songs, most of which are strident and loud. Riverside Wrens, like House Wrens, are masters of "theme and variations" singing - it seems each individual comes up with his own song, which fits snugly within their basic theme. Funny how such an inconspicuous bird can be so conspicuous. This call I refer to as the excited "stream" of calling. [Editor's note: This is almost certainly a duet -- CSP]
Douglas Von Gausig (recordist; copyright holder), Naturesongs.com
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