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(Redirected from Chrysomus icterocephalus icterocephalus)
Juveniles are similar to females, but duller, with less yellow on head, paler upperparts and buffish underparts obscurely streaked.
This species has previously been thought to belong to the genus Agelaius.
There are 2 subspecies:
Marshes and wet grasslands, along Amazon River and tributaries mostly in vĂˇrzea grassland.
This species likes to flock, sometimes associating with other species of Icterids.
Breeding season July to October in Venezuela, May to November in Trinidad, March to September in Suriname and March to May in central Colombia (bogotensis). The male builds a nest in aquatic vegetation, then uses a fluttering flight display to attract a female. If accepted the female adds more lining material to the nest. The male stays with her until she begins incubating the 2 or 3 eggs. He may mate with up to 5 females in the season; additional nests are within his territory. Occasionally, congregations of several males nesting next to each other and each with several females associated can lead to large colonies. About 30 to 40% of the nests are parasitized by Shiny Cowbird.
The diet includes aquatic insects, grain, and weed seeds.
Two song types, one with brief notes or whistles followed by harsh buzz, the other a variable and nice sequence of warbles or whistles. The two songs may be alternated. The song structure is similar to those of Chestnut-capped Blackbird, but it's less musical and harsher. Often sings in groups. The call is a chek or a descending whistle.
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