Ceanothus cyaneus, the San Diego buckbrush or lakeside ceanothus, a flowering plant species found in California and Baja California
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Copadichromis cyaneus, a fish species found in Malawi, Mozambique and Tanzania
Sirex cyaneus | Sassacus cyaneus | Copadichromis cyaneus | Ceanothus cyaneus |
Sassacus cyaneus, a jumping spider species native to Sonora in Mexico and parts of the United States
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Sirex cyaneus, the blue horntail, a wasp species native to Alberta, Canada