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Dorso ventral undulations of the body for propulsion
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What is a group of ocean life that includes larger animals that swim?
The larger animals that swim are called cetaceans.
Who is the top predator of the ocean killer whales or blue whales?
Killers whales. They eat practically everything (cetaceans, sirenians, pinnipeds, sea otters, sea turtles, sharks, rays, bony fishes, squid).
What was the common ancestor between elephants and sirenians?
The common ancestor between elephants and sirenians is Manatee.
Why do centaceans also known as manatees have useless tiny hips and legs?
You are mistaken there; cetaceans are dolphins and whales, not manatees; manatees are known as sirenians. They have useless hips and hind legs because they are so well adapted to a marine lifestyle and they no longer walk on land.
How many cetaceans are there?
84 living cetaceans (not extinct) though there are 7 extinct cetaceans
Who are the cetaceans?
the answer is not "who" but actually "what are" Cetaceans are marine mammals
Do narwhals live by themselves?
No, they are like most cetaceans and live in groups.
Is it true that young cetaceans are not precocial?
No, quite the opposite! All documented cetacean species have precocial young, in that they are mobile and active right after birth, much like horses or cows. For a species that is bound to the ocean, this is a requirement in order to survive, if a young porpoise could not move on it's own, it would not be able to swim up to the surface take breaths or keep up with it's mother. Likewise, the similarly water-bound sirenians (manatees and dugongs) are also precocial at birth.
Are all cetaceans mammals?
Yes, by definition cetaceans are an order of mammals.
When did the marine mammals evolved from land ancestors?
The ancestors of cetaceans began to move into the water and develop aquatic characteristics about 50 million years ago. They have been evolving ever since, gradually becoming more and more aquatic. Today's cetaceans live entirely in water. The ancestors of pinnipeds began moving into water much more recently, about 23 million years ago. Because of this, modern pinnipeds are not as fully aquatic as cetaceans. The ancestors of sirenians began moving into the water about 40 million years ago, and have been evolving since then.
What is the top speed of porpoises?
porpises can swim upto 20 - 30 kph depending on there breed and age
Can most mammals swim?
most can swim alot of mammals that can swim are dogs
