Difference between revisions of "Translations:AY Honors/Cetaceans/Answer Key/48/en"
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*Family Pontoporiidae: La Plata river dolphin | *Family Pontoporiidae: La Plata river dolphin | ||
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Latest revision as of 20:24, 20 September 2021
- Family Pontoporiidae: La Plata river dolphin
Pontoporia blainvillei
La Plata Dolphin (Pontoporia blainvillei)
Where found: La Plata dolphin is found in coastal Atlantic waters of southeastern South America. It is a member of the river dolphin group and the only one that actually lives in the ocean and saltwater estuaries, rather than inhabiting exclusively freshwater systems.
Description: The La Plata dolphin or Franciscana has the longest beak (as a proportion of body size) of any cetacean — as much as 15% in older adults. Males grow to 1.6 m (5 ft, 3 in) and females to 1.8 m (5 ft, 10 in). The body is a greyish brown colour, with a lighter underside. The flippers are also very large in comparison with body size and are very broad, but narrow on joining the body, so are almost triangular in shape. The trailing edges are serrated. The crescent-shaped blowhole lies just in front of a crease in the neck, giving the impression that dolphin forever has its head cricked upwards. The dorsal fin has a long base and a rounded tip. The La Plata dolphin weighs up to 50 kg (110 lb), and lives for up to 20 years. The gestation period is around 10–11 months and juveniles take just a few years to mature. Females may be giving birth by the age of five.
