Quick Harbor Porpoise facts
1. Harbor porpoises are among the smallest cetaceans in the Northern HemisphereHarbor porpoises are among the smallest cetaceans in the Northern Hemisphere.
2. The head is rounded and lacks the pronounced beak seen in most dolphinsThe head is rounded and lacks the pronounced beak seen in most dolphins.
3. Small spade-shaped teeth differ from the conical teeth of dolphinsSmall spade-shaped teeth differ from the conical teeth of dolphins.
4. They usually travel alone or in small groups rather than forming huge schoolsThey usually travel alone or in small groups rather than forming huge schools.
5. Surfacing is quick and unobtrusiveSurfacing is quick and unobtrusive, often revealing only a small triangular dorsal fin.
6. High-frequency echolocation clicks are beyond normal human hearingHigh-frequency echolocation clicks are beyond normal human hearing.
7. Harbor porpoises feed on small schooling fishHarbor porpoises feed on small schooling fish, squid and crustaceans.
8. Entanglement in gillnets is one of the most serious human-caused threatsEntanglement in gillnets is one of the most serious human-caused threats.
9. Harbor Porpoise is a marine mammalHarbor Porpoise is a marine mammal, so it breathes atmospheric air with lungs rather than extracting oxygen through gills.
10. It is warm-blooded and maintains a relatively stable internal temperature…It is warm-blooded and maintains a relatively stable internal temperature despite living in water.
11. Females give birth to live young and nurse calves with energy-rich milkFemales give birth to live young and nurse calves with energy-rich milk.
12. A streamlined body reduces drag and allows efficient movement through the oceanA streamlined body reduces drag and allows efficient movement through the ocean.
13. Insulating fat beneath the skin helps store energy and limit heat lossInsulating fat beneath the skin helps store energy and limit heat loss.
14. Harbor Porpoise must return to the surface regularly to exhale…Harbor Porpoise must return to the surface regularly to exhale and take a fresh breath.
15. Its hearing system is adapted for underwater soundIts hearing system is adapted for underwater sound, where acoustic signals travel farther than they do through air.
16. Like other cetaceans, the forelimbs are modified into flippers while…Like other cetaceans, the forelimbs are modified into flippers while propulsion comes mainly from horizontal tail flukes.
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Why harbor porpoise are fascinating
Harbor porpoises are small coastal cetaceans with blunt snouts and rapid quiet surfacing behavior. Looking at these traits together reveals how the animal solves the everyday challenges of feeding, movement, communication, reproduction and survival.
Frequently asked questions
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