Alectrurus risora - The male strange-tailed tyrant has a pair of extremely long tail-streamers as an addition to its long tail. This feature serves no other purpose than to attract females, also having long tails, but lack the additional tail-streamer feathers. Females average 20 centimeters in length with males averaging 30 centimeters. Some strange-tailed tyrant populations migrant seasonally between Paraguay and Argentina, but most are in permanent resident throughout their range.
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The drainage basin for the Rio de la Plata is 3,170,000 square kilometers, one of the largest in the world. The estuary forms the border between Argentina and Uruguay; each country’s respective capital is located along the shores. The gap formed by the mouth of the Rio de la Plata is large enough for some geographers to consider it a gulf on the Atlantic Ocean. The mouth of the Rio de la Plata is the largest of any river in the world; it is 220 kilometers wide and easily surpasses the Amazon River.
