Whales, dolphins and porpoises are all cetaceans — mammals that live in water and have a streamlined body similar to a fish.
Whales, dolphins and porpoises all live in water, but they’re not fish. They’re water-dwelling mammals known as cetaceans (Seh-TAY-shuns). This group includes the largest animals on Earth — blue whales — which can grow up to 29.9 meters (98 feet) in length. Most cetaceans live in the ocean, but there are a few species that live in freshwater or brackish water (water that is salty, but not as salty as the ocean). Cetaceans don’t have gills as fish do. To get the oxygen they need, these mammals breathe in air through structures called blowholes.
Cetaceans are split into two groups based on what and how they eat. Toothed whales — such as sperm whales, orcas (killer whales), dolphins, narwhals and porpoises — all have teeth that help them catch prey. They eat fish, squid and other large critters. Orcas have been known to eat penguins, seals, sharks and other whales. Most species of toothed whales can use echolocation to find prey.
See all the entries from our Let’s Learn About series
Baleen whales lack teeth. Instead, plates of baleen line their mouths. That baleen is made of keratin — the same stuff as hair — and lets the whale filter krill and other small invertebrates from the water to eat. Humpback whales in Alaska, though, have figured out they can get a free meal of tiny salmon by hanging out at fish hatcheries.
Scientists have had to get creative when it comes to studying these animals. One group figured out how to weigh a whale using drone imagery. Others use acoustic tags and other techniques to study the social lives of whales and dolphins. And sometimes scientists just get lucky. Like when researchers driving an underwater robot came across a decomposing whale at the bottom of the ocean — and found an entire community feasting on the dead.
Want to know more? We’ve got some stories to get you started:
Why some whales become giants and others are only big Being big helps whales access more food. But just how big a whale can get is influenced by whether it hunts or filter-feeds. (1/21/2020) Readability: 6.9
The social lives of whales New tools are giving scientists an unprecedented glimpse into the behaviors of whales and dolphins. And these new data are upending long-held assumptions. (3/13/2015) Readability: 7.0
Whales get a second life as deep-sea buffets When a whale dies and sinks to the seafloor, it becomes a feast for hundreds of different types of creatures. (10/15/2020) Readability: 6.6
Scientists Say: Krill
Scientists Say: Echolocation
Explainer: What is a whale?
Cool Jobs: A whale of a time
A whale of a journey
Drones help scientists weigh whales at sea
Whales feast when hatcheries release salmon
Killer whale blows raspberry, says ‘hello’
Sperm whales’ clicks suggest the animals have culture
Whales echolocate with big clicks and tiny amounts of air
Whale blowholes don’t keep out seawater
Learn more about whales and dolphins through crossword puzzles, coloring sheets and other activities from Whale and Dolphin Conservation. All of the activities are presented in English — and Spanish. French and German translations also are available.
A blocked milk duct can be painful. It can lead to a more painful and more serious condition called mastitis. Most women never experience a blocked duct or mastitis. Some women develop blocked ducts or mastitis more than once. If you are breastfeeding, you can’t completely eliminate the risk of developing a blocked duct or developing mastitis, but there are ways to reduce your risk that. Blocked Duct or Mastitis? A blocked or clogged milk duct is pretty much what it sounds like. The milk ducts are the tiny tubes that bring breast milk from the glandular lobules in your breast—where the milk is made—to the nipple, where your baby feeds. If these ducts become blocked for any reason, the lobules keep producing milk that has nowhere to go. The milk...
I don’t know about you but nothing hits the spot more on a hot summer day than fresh fruit and salads! Combine the two together and our melon salad will leave you feeling refreshed and satisfied! This simple melon salad is easy to make but completely delightful to your tastebuds! It cools you down with the watery melon taste but adds a splash of flavor with the citrus honey mint dressing! Pair this with our burgers, corn, and some lemonade. These 4 recipes will create a summer meal for the books!
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The crowd immediately got to its feet once Malik Nelson (1-0, 1 KO) was announced. The former amateur standout made a successful debut earlier tonight against Alejandro Ramirez (0-2).
After dropping his man twice in the opening round, the newly turned pro closed the show in the third round after a barrage of punches.
The post Michael Coffie Vs. Jonathan Rice Undercard Results: Malik Nelson Makes It Look Easy Against Alejandro Ramirez appeared first on BoxingInsider.com.
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Kelston and Jackie Tobin didn’t intend to circumnavigate Britain, but after cruising from Kent to the Solent they decided to keep on going...Jackie relishing a glass or two of fizz during an evening in Newtown Creek, the Isle of Wight. Words and photos: Kelston and Jackie Tobin.Since Jackie and I bought our 1990 Broom 37 Boisterous Mistress in 2004 we have never had a permanent mooring. Most winters we moored her in London, initially in Limehouse marina and later in South Dock marina, then during the summer months we cruise around the English Channel taking in everywhere from Holland in the north to the Channel Islands in the south, so we are quite used to leaving her in different marinas...
News on the BlackBerry comeback has been scant and pretty much boils down to the transfer of the license to develop under the brand name and a rough release schedule. But on Monday, Onward Mobility has reminded us anew that it’s still set on launching a new handset, but there’s a catch. The company wants BlackBerry fans to join its precommitment program so it can gauge consumer interest. When you join the program, you’ll be among the first to receive news and updates regarding products, features, and availability. Your input and feedback will also be considered in what features and functionality will end up in the upcoming devices. And lastly, you can preorder and be the first few to receive the device, assuming it does launch. So,...