Vedci to zatia\u013e nepotvrdili, no \u017eraloky nevidia duchov.<\/strong><\/p>\n Dok\u00e1\u017eu v\u0161ak vyc\u00edti\u0165, aj to \u010do nevidia. <\/strong><\/p>\n \u017draloky maj\u00fa \u0161iesty zmysel<\/strong>, ktor\u00fd vyu\u017e\u00edva jedine\u010dn\u00fd org\u00e1n naz\u00fdvan\u00fd Lorenziniho ampulky, ktor\u00fd im umo\u017e\u0148uje vn\u00edma\u0165 elektrick\u00e9 podnety a je obzvl\u00e1\u0161\u0165 u\u017eito\u010dn\u00fd pri love skrytej koristi. <\/strong><\/p>\n Ve\u013ek\u00e9 \u017eraloky kladivohlav\u00e9 pou\u017e\u00edvaj\u00fa svoje hlavy ako detektory a m\u00e1vaj\u00fa nimi sem a tam nad dnom oce\u00e1nu, aby na\u0161li a lovili raje.<\/strong><\/p>\n <\/p>\n Niektor\u00e9 druhy \u017eralokov s\u00fa skuto\u010dne v\u00fdnimo\u010dn\u00e9.<\/p>\n K\u00fdm je toti\u017e samica \u017eraloka tehotn\u00e1, dve najv\u00e4\u010d\u0161ie \u017eralo\u010die ml\u00e1\u010fat\u00e1 v jej lone skonzumuj\u00fa svojich nenaroden\u00fdch s\u00farodencov. <\/strong><\/p>\n T\u00e1to prax, zn\u00e1ma aj ako vn\u00fatromaternicov\u00fd kanibalizmus, sa m\u00f4\u017ee zda\u0165 extr\u00e9mna<\/strong>, no pom\u00e1ha zabezpe\u010di\u0165, aby pre\u017eili len tie najsilnej\u0161ie \u017eralo\u010die ml\u00e1\u010fat\u00e1.<\/p>\n Bonusov\u00fd fakt: Samice niektor\u00fdch \u017eralokov maj\u00fa dve maternice!<\/strong><\/em><\/p>\n <\/p>\n \u017dralo\u010d\u00ed chrup, sen mnoh\u00fdch, realita pre p\u00e1r. Zdroj: smithsonian.com\n Ak niekto nepotrebuje chodi\u0165 k zub\u00e1rovi,<\/strong> tak je to pr\u00e1ve \u017eralok.<\/p>\n Vedeli ste, \u017ee \u017eralokom m\u00f4\u017ee po\u010das \u017eivota nar\u00e1s\u0165 viac ako 30 000 zubov? <\/strong><\/p>\n Na rozdiel od \u013eud\u00ed, ktor\u00ed maj\u00fa jednu sadu 32 st\u00e1lych zubov<\/strong>, ke\u010f \u017eralok strat\u00ed zub, nov\u00fd r\u00fdchlo zaujme jeho miesto, aby zabezpe\u010dil, \u017ee t\u00edto vrcholov\u00ed pred\u00e1tori bud\u00fa v\u017edy pripraven\u00ed na \u010fal\u0161iu ve\u010deru.<\/strong><\/p>\n Ak by ste nahliadli do \u017eralo\u010dej tlamy (odborn\u00edci to neodpor\u00fa\u010daj\u00fa)<\/strong>, v\u0161imli by ste si nieko\u013eko radov zubov za ich prv\u00fdm radom.<\/p>\n Tieto rady zubov le\u017eia naplocho vo vn\u00fatri \u017eralo\u010dej tlamy ako z\u00e1loha, k\u00fdm zub nevypadne.<\/strong><\/p>\n <\/p>\n Okrem skvel\u00e9ho benefitu nekone\u010dn\u00fdch nov\u00fdch zubov, sa \u017eraloky nemusia b\u00e1\u0165 ani vysok\u00fdch \u00fa\u010dtov za v\u0155tanie kazov.<\/strong><\/p>\n Pre\u010do je to tak?<\/p>\n Je to v\u010faka tomu, \u017ee povrch ich zubov je pokryt\u00fd fluoridom, ktor\u00fd ich tak prirodzene chr\u00e1ni pred kazom.<\/strong><\/p>\n <\/p>\n \u017draloky nemaj\u00fa hlasivky, tak\u017ee nie s\u00fa schopn\u00e9 vyd\u00e1va\u0165 hluk ako in\u00e9 morsk\u00e9 \u017eivo\u010d\u00edchy<\/strong>, ako s\u00fa delf\u00edny, ve\u013eryby alebo tulene.<\/p>\n <\/p>\n V oce\u00e1noch je zaznamenan\u00fdch viac ako 1 000 druhov \u017eralokov<\/strong> a raj\u00ed, a pod\u013ea spr\u00e1v z \u010cerven\u00e9ho zoznamu IUCN, je takmer 40 % t\u00fdchto druhov ohrozen\u00fdch vyhynut\u00edm<\/strong> v d\u00f4sledku environment\u00e1lnych vplyvov, ako je nadmern\u00fd rybolov, ved\u013eaj\u0161ie \u00falovky, strata biotopov a zmena kl\u00edmy.<\/p>\n <\/p>\n Takzvan\u00fd \u017eralo\u010d\u00ed p\u00f4rod. Zdroj: shark.swiss\n \u017draloky s\u00fa jedn\u00fdm zo vz\u00e1cnych zvierat, ktor\u00e9 v z\u00e1vislosti od druhu m\u00f4\u017eu rodi\u0165 \u017eiv\u00e9 ml\u00e1\u010fat\u00e1, kl\u00e1s\u0165 vaj\u00ed\u010dka alebo kombin\u00e1ciu oboch. <\/strong><\/p>\n Asi 40 % \u017eralokov je vajcorod\u00fdch.<\/strong><\/p>\n <\/p>\n \u017draloky existuj\u00fa u\u017e viac ako 450 mili\u00f3nov rokov<\/strong>, zatia\u013e \u010do najstar\u0161\u00ed strom \u017eil asi pred 350 mili\u00f3nmi rokov.<\/p>\n \u017draloky s\u00fa nielen star\u0161ie ako stromy, ale s\u00fa tie\u017e jedn\u00fdm z m\u00e1la zvierat, ktor\u00e9 pre\u017eili \u0161tyri z piatich masov\u00fdch vyhynut\u00ed.<\/strong><\/p>\n <\/p>\n Modern\u00e1 doba n\u00e1s nau\u010dila, aby sme sa b\u00e1li \u017eralokov, no v skuto\u010dnosti s\u00fa \u017eraloky menej nebezpe\u010dn\u00e9 ako padaj\u00faci kokos! <\/strong><\/p>\n Padaj\u00face kokosov\u00e9 orechy zabij\u00fa ro\u010dne 30-kr\u00e1t viac \u013eud\u00ed ako \u017eraloky<\/strong> \u2013 znie to \u0161ialene, ale je to tak.<\/p>\n V skuto\u010dnosti, pokia\u013e ide o \u013eud\u00ed vs. \u017eraloky, \u013eudia s\u00fa ove\u013ea nebezpe\u010dnej\u0161\u00edmi pred\u00e1tormi, ktor\u00ed ka\u017edoro\u010dne zabij\u00fa pribli\u017ene 100 mili\u00f3nov \u017eralokov <\/strong>pri rybolove.<\/p>\n Na porovnanie, v d\u00f4sledku \u00fatokov \u017eralokov je ka\u017ed\u00fd rok zabit\u00fdch len asi p\u00e4\u0165 \u013eud\u00ed.<\/strong><\/p>\n <\/p>\n Ve\u013ek\u00e9 biele \u017eraloky s\u00fa \u0161ed\u00e9 s bielym podbru\u0161kom, pod\u013ea \u010doho dostali svoje meno.<\/p>\n Maj\u00fa aerodynamick\u00fd tvar a siln\u00e9 chvosty, ktor\u00e9 ich poh\u00e1\u0148aj\u00fa cez vodu r\u00fdchlos\u0165ou viac ako 60 km za hodinu!<\/strong><\/p>\n <\/p>\n Pred 20 mili\u00f3nmi rokov dominoval v oce\u00e1noch megalodon (\u010do znamen\u00e1 ve\u013ek\u00fd zub) a bol bl\u00edzkym pr\u00edbuzn\u00fdm dne\u0161n\u00e9ho ve\u013ek\u00e9ho bieleho \u017eraloka.<\/p>\n Na z\u00e1klade fos\u00edlnych d\u00f4kazov r\u00e1stli medzi neuverite\u013en\u00fdch 15 a\u017e 18 metrov, pri\u010dom v\u00e1\u017eili viac ako 25 ton<\/strong> \u2013 v\u010faka \u010domu sa dne\u0161n\u00fd \u017eralok biely zd\u00e1 v porovnan\u00ed s n\u00edm mal\u00fd (6 metrov na d\u013a\u017eku a 2,2 tony)!<\/p>","protected":false},"excerpt":{"rendered":" Keby bol mentalista zviera, bol by \u017eralok: tieto zvierat\u00e1 maj\u00fa \u0161iesty zmysel! Vedci to zatia\u013e nepotvrdili, no \u017eraloky nevidia duchov. Dok\u00e1\u017eu v\u0161ak vyc\u00edti\u0165, aj to<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[51],"tags":[],"class_list":["post-8749","post","type-post","status-publish","format-standard","hentry","category-archiv","two-columns"],"_links":{"self":[{"href":"https:\/\/instrid.sk\/en\/wp-json\/wp\/v2\/posts\/8749","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/instrid.sk\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/instrid.sk\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/instrid.sk\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/instrid.sk\/en\/wp-json\/wp\/v2\/comments?post=8749"}],"version-history":[{"count":0,"href":"https:\/\/instrid.sk\/en\/wp-json\/wp\/v2\/posts\/8749\/revisions"}],"wp:attachment":[{"href":"https:\/\/instrid.sk\/en\/wp-json\/wp\/v2\/media?parent=8749"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/instrid.sk\/en\/wp-json\/wp\/v2\/categories?post=8749"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/instrid.sk\/en\/wp-json\/wp\/v2\/tags?post=8749"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}S\u00faboj za\u010d\u00edna u\u017e v maternici<\/h3>\n
\u017draloky m\u00f4\u017eu strati\u0165 viac ako 30 000 zubov za cel\u00fd \u017eivot<\/h3>\n
\u017dralo\u010die v\u00fdhody u zub\u00e1rov nemaj\u00fa hran\u00edc<\/h3>\n
V \u017eralo\u010dej r\u00ed\u0161i sa nezrod\u00ed hviezda<\/h3>\n
Mnoho druhov \u017eralokov je ohrozen\u00fdch<\/h3>\n
\u017draloky m\u00f4\u017eu rodi\u0165 tromi r\u00f4znymi sp\u00f4sobmi<\/h3>\n
\u017draloky s\u00fa star\u0161ie ako stromy<\/h3>\n
Kokosy s\u00fa nebezpe\u010dnej\u0161ie ako \u017eraloky<\/h3>\n
Vra\u017eedne r\u00fdchly \u017eralok biely<\/h3>\n
Megalodon bol najv\u00e4\u010d\u0161\u00ed \u017eralok, ktor\u00fd kedy \u017eil<\/h3>\n