This page features a Dolphins Game Quiz Online. It is an exercise for students studying science in 3rd, 4th, 5th, 6th to 8th grades. Students will learn about dolphins in this online quiz. Remember to learn more by readding the article below.
If you're wondering which marine mammals are smaller and chubbier then consider dolphins and porpoises. There are several differences between porpoises and dolphins. Dolphins are sociable creatures, while porpoises don't interact with humans. This article will explain how to distinguish between them. For starters, dolphins have larger geographical ranges than porpoises, and dall's porpoises have longer pectoral fins.
Although they share a common habitat in the North Pacific, Dall's porpoises and Harbour porpoises are two distinct species. Dall's porpoises have striking black and white patterns and a distinctive white blaze on their dorsal fins. The differences between these two species are often confusing to people who don't know which to look for.
The Dall's porpoise is the largest of the two porpoise species and is the only member of its genus. They are highly active and gregarious, and are recognizable by a distinctive white patch on their lower stomachs and behind their flippers. These creatures are large, and their only predator is the Transient killer whale.
Dall's porpoises and Harbours share similar habits. While Harbour porpoises are less likely to approach boats and do not commonly breach the surface, they will often come up to feed along the tide line. Although they do not approach boats, they do occasionally display curiosity towards them and "surf" in the wake of vessels. This behavior is likely related to their social structure.
Dall's porpoises are faster swimmers than Harbour porpoises
While Harbour porpoises are slower swimmers, Dall's are more agile. These lean speed demons have been known to be mistaken for baby killer whales and harbour porpoises. They are a much less common species in the Salish Sea, but they're still incredibly fast.
The male Dall's sexual maturity is approximately four to five years old, while the female is around six to seven years old. During their reproductive season, Dall's porpoises give birth to one calf a year. Calves typically measure three to four feet long. A female can give birth to a single calf as young as five months, and the calf can stay with its mother for another nine months or so. Dall's porpoises live for up to 22 years. They prefer temperate to boreal waters, deep waters, and offshore oceanic areas.
The Dall's porpoise is the fastest of the small cetaceans. It can swim up to 35 miles per hour and create a "rooster tail" at the surface. They typically ride on bow waves of boats and rarely come close to shore. In addition to being faster swimmers, Dall's porpoises are more docile and shy around boats than Harbour porpoises.
Harbour porpoises have a smaller geographic range than Dall's porpoises
The geographical range of the harbor and Dall's porpoises differ. The latter species spends most of its time near shore, and its range extends as far north as West Greenland. The former, however, is not commonly found in Hudson Bay. Their distribution is restricted to coastal waters in the Northern Hemisphere, while the latter is found primarily in the Arctic.
Both harbor and Dall's porpoises live in coastal waters and are found in small groups of three to eight animals, though the latter are often seen alone or in pairs. Large aggregations of 50 to 100 animals have also been observed, but this is not a common sight. Because of their small size, these creatures are less likely to approach humans and boats, but they do sometimes swim close to shore.
Despite their smaller geographic range, harbor and Dall's porpoises share the same food sources. Their diets are similar, with Pacific herring and Walleye pollock as the major food sources. Their geographic ranges and seasonal distributions may change, making them more or less dependent on one another's habitats. However, there are many differences between the two species, so it is important to not confuse both.
Dall's porpoises have a longer pectoral fin Dolphins and Dall's porpoises both have long pectoral fins, and dolphins have a triangular dorsal fin. While both have a similar gray-brown body, dolphins have a much longer pectoral fin. Dall's porpoises are similar in coloring, with white-tipped tail flukes and prominently white flank patches. Dall's porpoises can weigh up to 400 pounds, and are found only in the north Pacific and southwestern Atlantic.
The Dall's Porpoise is the fastest of all small cetaceans, swimming at speeds up to 35 mph. It creates a characteristic "rooster tail" when it's on the surface, and they are known for riding bow waves on fishing boats. Because they prefer deep water, these animals rarely venture near the shore. Sadly, they are often caught and killed by Japanese fishers, and the population is declining.