what's the difference between sea otters and river otters?
455588
River Otters are smaller and is found throughout Canada, eastern US, Northwestern US down to parts of Northern California.  They are also nocturnal.Their main prey is fish. They also spend more time on land than sea otters that rarely ever leave the ocean. Few animals prey upon River Otters. \n\nSea Otters diurnal, and are larger than river otters. Their fur is also denser. They are mainly found in Alaska and parts of Northern California. Sea otters prey upon sea urchins and abalone and use tools for eating unlike river otters. Sea Otters are often hunted by orca whales.
339482
Technically, there is no such a thing as a "seagull." They're actually just gulls. As a group, they don't live exclusively at, near, in or over the sea. There are some species (like ring-biled gulls) that are more common inland than at the sea. They find their way to large open areas (such as parking lots and school yards) by flying over them. You can see a lot of land from that height, so it's not hard to pick out nice spots to hang. They are not confused into thinking it's water, they just know by now that large parking lots are good eatin'.
695857
osmosis\nbecause there is a higher water potential inside the seahorse. the sea contains more salt than the seahorse (suprisingly! Lmao) so there is more water in the seahorse. the water molecules travel down the concentration gradient and so the seahorse loses water. though as it is in the sea i doubt this really bothers it
12677
God made them that way...lol....they are different animlas. Gosh why are whales bigger than guppies?
295017
Pigs and hogs both have stomachs. A hog is just a large pig.
392410
Actually, amarsupials are mammals. They are a sub group just as is the other group that includes the platapus and echidna (can't remember the name of this group).\n\nThe difference is that the young is succled in a pouch. \n\nThey are born alive, not in egg, they are warm blooded, as all mammals do/are.
513168
Birds, Definitely. birds, being warm blooded, are much closer to mammals than amphibians. Amphibians only show the faintest glimmer of an R-Complex, known in your brain as a cerebellum - the reptilian part of the brain. Birds, by contrast, have a highly developed R-complex and even show the beginnings of a cerebrum (the big lumpy part of your brain that handles all that rational though stuff). Can you imagine a frog or a salamander uttering, "Polly wants a cracker?" >:)
763563
lemmings travel farther 4 the same cause as the salmons do \n\nin their way \nthey enter the sea\nstart swimming \nget tired \nand drown \n\nthis is  often called a suicide
862981
Seals evolved from some terrestrial animal because anatomical analysis shows a 5-digit fin.  It probably evolved from a bear or otter-like creature.   Many mammals spend the majority of their time in the ocean, and when feeding is more successful in the ocean than on land, aquatic adaptations derive.
484542
Emperor is the largest penguin and Adele is the smallest.\nEmperor lays one egg, Adele lays 2.\nEmperor nests on the fast ice, Adele nests on the rocky beaches.
1115596
Sea-monkeys are these tiny aquatic creatures that are similar to shrimp or brine. They sell kits (novelty item) with them so you can see them hatch and swim around. Never heard of a sea-donkey which I guess could also be called a sea-ass. An ass is an animal mentioned in the bible. They replaced it with asterisks since using it to refer to buttocks is vulgar.\n\nYou could click on wikipedia to see if they have it.
339816
Both of them are important.They have various habitats,ecosystem etc but that doesnt mean one is more important than the other.Extinction of a single species can lead to imbalance in the food chain and other species may start dying as a result.\n\nSo every living creature is important in the ecosystem.
1010312
yes.\n\nthey are mammals and do not breathe underwater.\n\nthey take in air at the surface, so it does not matter what type of water they live in.
1080152
I can't be certain, but I would hazard a guess that it might be an otter.\n\nOtters often swim with their legs tucked up against their body, making them appear to be almost serpent-like as they twist and roll through the water.
859827
alligators have a frog rounded shaped mouth and live in fresh water most of the time. Have been seen in salt water.\nCroc's have a long snout.  And Usually reside in salt water.
644406
Sirenia is an order of fuaquatic, herbivorous mammals that live in rivers, estuaries and coastal marine waters. Commonly called manatees, dugongs, or seacows, they have significant aquatic adaptations: forelimbs have changed into arms used for steering, the tail has changed into a paddle used for propulsion and the hindlimbs (legs) are  two small remnant bones.
468060
crao_craz is correct.  \n\nOne of the main differences in the two groups is in the form of the pen/cuttlebone.\n\nCephalopod groups differ in the level to which they have retained or lost the shell ancestral to their mollusc lineage.\n\nThe extinct ammonites had a large, robust shell that protected their body and also provided ballast and buoyancy for deep diving.\n\nThe modern nautilus has a shell, but it is not as robust as the ammonite shells were.\n\nAnother extinct group, the belemnites, had an internal shell, used primarily for buoyancy issues.  It looked almost like a cigar encasing the rear portion of their anatomy.\n\nCuttlefish also have the remnant of an internal shell.  It's essentially a turtle-like shield of bone that sits on the back of the animal.  It is porous and can trap gases, useful as ballast.  They used to use this cuttlebone for a number of purposes, including maintaining/sharpening the beaks of pet birds.  You can still buy cuttlebones for this purpose, and they're still in the cuttlebone shape, but are no longer made from actual cuttlefish bone.\n\nIn squids, the shell is reduced to nothing but a pen.  This is a sheet of stiffening cartilage-like material in the mantle that provides support and structure to the squid's body.  In most species it's transparent, and about the thickness and consistency of the plastic they use to make blister packs of batteries.\n\nIn octopus, the pen is gone completely, allowing them to squeeze through cracks and crevices as long as they can fit their eyeballs and beaks through.