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Delfini - PowerPoint PPT Presentation


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Delfini. Delfini imajo tudi drugo ime, ki je Delphinidae . Poznamo 34 vrst delfinov. Spadajo v podred zobatih kitov. Orientirajo in sporazumevajo se z zvočnimi signali.

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Delfini


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Presentation Transcript
slide3

Spadajo v podred zobatih kitov.

Orientirajo in sporazumevajo se z zvočnimi signali.

slide4

V ustih imajo od 50 do 120 zob, s katerimi zgrabijo spolzek plen, kot so ribe in mehkužci. Delfini hrane ne žvečijo, temveč jo pogoltnejo. Pri delfinih dihanje ni

avtomatično kot pri nas.

slide5

Žival mora načrtovati vsak dih. Zato delfini nikoli ne spijo. Vsaj ne tako

kot mi. Spijo samo s polovico možganov. Ko delfin spi , počiva samo polovica

možganov, druga pa nadzoruje okolico, in skrbi, da žival plava in pazi na morebitne nevarnosti.

slide6

Vsake 4 ure se polovici zamenjata. Ena hemisfera – polovica možganov je

Vedno budna. Tako delfin dejansko celo življenje plava.

slide8

Oglejte si prikupen filmček z delfinom in muco

http://www.youtube.com/watch?v=fPPlaNPH8Wg

Izdelala Neja Lenart