Mary Allen
Narwhals pub rau Greenland halibut, Arctic thiab polar cod, squid, thiab cw. Lawv ua lawv chomping ntawm ntug dej khov floe ntug thiab hauv cov dej khov tsis muaj caij ntuj sov.
narwhals zoo li cas?
Cov yam ntxwv tseem ceeb tshaj plaws ntawm narwhals yog ob mus rau peb meter ntev tusk, uas feem ntau txiv neej narwhals nqa, tab sis tsuas yog ob peb tus poj niam. Narwhals muaj lub hauv pliaj kheej kheej, lub qhov ncauj sib npaug, tsis muaj dorsal fin, thiab luv luv, blunt pectoral fins. Lawv tsis muaj ib tug protruding beak. Lub caudal fin muaj xws li peculiarly zoo li tus trailing ntug uas nws zoo li nws tau txuas upside down. Ua ke nrog cov belugas, lawv tsim tsev neeg ntawm goby whales (Monodontidae).
Koj lub neej txhua hnub zoo li cas?
Narwhals nyob hauv pab pawg ntawm 10 mus rau 20 tus neeg, tab sis thaum lub caij ntuj sov lawv sib sau ua ke ntau pua lossis ntau txhiab tus neeg pib tsiv teb tsaws chaw. Lawv ua luam dej ze ua ke thiab ze rau saum npoo. Qee lub sij hawm, txhua pab pawg neeg yuav dhia tawm hauv dej thiab dhia rov qab rau tib lub sijhawm. Qhov laj thawj rau tus cwj pwm no tseem tsis tau paub.
Qhov tob tshaj plaws dhia dej ntawm ib tug narwhal yog 1,500m. Lawv tuaj yeem tuav lawv ua pa ntev txog 25 feeb.
Lawv noj dab tsi?
Narwhals nyiam flatfish, cod, cws, squid thiab crab, uas lawv pom nyob rau hauv dej hiav txwv pem teb thaum lawv dhia dej ntev. Lawv siv echolocation los nrhiav zaub mov thiab muaj kev nthuav dav ntawm kev pub mis: lawv tsim ib lub tshuab nqus tsev thiab nqus lawv cov zaub mov.
Koj nyob qhov twg?
Narwhals nyob hauv cov dej sab qaum teb ntawm Arctic Circle, mus txog ntawm ntug ntawm daim ntawv dej khov, thiab feem ntau pom muaj nyob rau ntawm pob dej khov. Nyob rau lub caij ntuj sov lawv tsiv mus nyob ze rau ntawm ntug dej hiav txwv ntawm Canada thiab Greenland rau hauv txias, tob fjords thiab bays.
Lawv cov yeeb ncuab ntuj yog polar bears, orcas, thiab qee hom sharks. Lawv raug tua los ntawm tib neeg rau ntau pua xyoo rau lawv cov kaus ntxhw tusk.
Txij li thaum lawv qhov chaw nyob yog nyob ntawm ntug pob dej khov, lawv tshwj xeeb cuam tshuam los ntawm kev hloov pauv huab cua.
Puas yog narwhal predators los yog prey?
Pom feem ntau hauv Canadian Arctic thiab Greenlandic thiab Lavxias dej, narwhal yog ib qho tshwj xeeb tshwj xeeb hauv Arctic tsiaj txhu. Nyob rau hauv lub caij ntuj no, nws pub rau benthic prey, feem ntau flatfish, nyob rau hauv ntom ntim dej khov.
narwhals tau txais lawv cov zaub mov li cas?
Narwhals nyiam cov ntses flatfish, cod, cws thiab squid thiab hom zoo li roob ris uas lawv pom ntawm ntug hiav txwv thaum lawv dhia dej ntev. Lawv siv echolocation los pab lawv nrhiav zaub mov thiab muaj kev lom zem ntawm kev noj mov - tsim ib lub tshuab nqus tsev thiab nqus lawv cov zaub mov.
Dab tsi yog narwhal lub horn rau?
Tusk hloov pauv zoo li yog siv los ua ib qho cuab yeej rau kev paub txog kev hloov pauv hauv ib puag ncig, zoo li qhov sib txawv ntawm cov dej kub, ntsev, thiab muaj cov tsiaj nyob ze. Cov kws tshawb fawb ib zaug xav tias narwhal tusks tau siv rau kev sib ntaus sib tua, tab sis narwhals tiag tiag rub lawv horns tawm tsam ib leeg rau kev ntxuav.
Puas yog narwhals noj jellyfish?
Lub narwhal hooves nce 99-176 lb (45-80 kg) ntawm ntses, prawns, thiab jellyfish txhua hnub.
Puas yog narwhals tus phooj ywg zoo rau tib neeg?
Hmoov tsis zoo, narwhals yuav tsis tau nruab los daws cov kev sib ntsib ze nrog tib neeg. Thaum cov whales no ntsib teeb meem uas lawv tsis tau siv, lawv lub cev ua rau muaj kev ntxhov siab, cov kws tshawb fawb tau tshaj tawm hnub no hauv Science.
Dab tsi yog narwhal tusks ua los ntawm?
Lub narwhal tus tusk yog tus hniav uas muaj ntau lab tus paj hlwb. Qhov ntawd txhais tau tias koj tuaj yeem siv nws los "xav" lossis saj nws. Narwhals muaj ob tug hniav thiab nyob rau hauv cov txiv neej cov hniav laug feem ntau tsim ib tug tusk. Qee tus muaj ob tus ntses, thiab kwv yees li peb feem pua ntawm cov poj niam narwhals kuj muaj ib tus ntses.