Ny trondro dia karazana hazandrano rakotra kira, ary ny fivoy no hihetsehany ao anaty rano, biby manan-taolan-damosina velona anaty rano ary miaina amin' ny alalan' ny sagoaga.
Izy ireo dia velona nanomboka tamin' ny tenatenan' ny fotoana faha-kambrianina. Manana ra mangatsiaka ny ankamaroan' ny kazaran-trondro.
"Karazana hazandrano somary fisapisaka, ny tenany rakotra kira masaisay ary manam-pitaovana ahafahany mihetsika ao anaty rano: vombony iray ao an-damosiny, fivoy milaha-droa eo ambany tratrany sy ambany kibony, fivoy iray indray ao am-poto-kibony, ary ny rambony, izay mikapoka miankavia sy miankavanana rehefa mitsoriaka izy; misy karazany roa ny trondro: ny trondron-dranomamy sy ny trondron-dranomasina; manatody ny trondro amin' ny fararano, izay foy amin' ny voalohandohan' ny ririnina. Anisan' ny tsara sy matsiro ny trondro; laokandrano, laoka".
Matetika afangaron' ny olona ny hevitry ny teny hoe trondro sy hazandrano, nefa ny hoe hazandrano dia "anarana iraisan' ny biby fanjono".
Trondro:
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