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Crocodilii
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Crocodilii
de Stefan_usher



Crocodilii de astazi sunt urmasii directi ale stravechilor soparle cu platosa, foarte apropiati de dinozauri. Crocodilii prefera fluviile care curg incet, rauri, lacuri continentale si mlastini. Ei sunt raspanditi in zonele calde ale continentului. Ei trec de perioadele secetoase, dormind de obicei, in namol.

Aceste reptile se impart in trei familii: a crocodililor, a aligatorilor, a gavialilor. Dintre crocodili, cei mai importanti sunt: crocodilul de Nil si crocodilul cu creste, care pot atinge 7 – 9 m lungime. Crocodilul cu creste, raspandit in Asia de Sud Est pana in Australia de Nord, prezinta doua creste osoase, asezate deasupra botului, de la varful acestuia pana la ochi. Acest crocodil este foarte mancacios.

Crocodilul de Nil este aproape exterminat pe cursul inferior, supravietuind in forma muntoasa si a marilor lacuri. Crocodilul consuma, pe langa hrana, si pietre care raman in organism pentru totdeauna. Pietrele inghitite de aceste animale au un rol hidrostatic ; datorita lor, crocodilul se mentine intr – o anumita regiune a apei, in ciuda curentilor puternici, si tot pietrele ii ajuta sa–si traga mai usor victima in apa. "Lacrimile de crocodil" nu reprezinta altceva decat eliminarea axcesului de saruri, patrunsa o data cu apa si hrana.
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