Cinnamomum cassia component called coumarin, which could damage the liver if consumed in larger amounts, European health agencies have warned against consuming high amounts of cassia. Other bioactive compounds found in the bark, powder and essential oils of "C. cassia" are cinnamaldehyde and styrene. In high doses these substances can also be toxic for humans. Cinnamomum cassia Cinnamomum cassia, called Chinese cassia or Chinese cinnamon, is an evergreen tree originating in southern China, and widely cultivated there and elsewhere in southern and eastern Asia (India, Indonesia, Laos, Malaysia, Taiwan, Thailand, and Vietnam). It is one of several species of "Cinnamomum" used primarily
Cassia crossbill It is believed that crossbills used the public information of different calls to forage. This eventually led to assortative flocking when crossbills would follow vocalizations that would provide them the easiest route to food. This can be another mechanism to how the Cassia crossbill diverged from the red crossbill. The Cassia crossbill and the other red crossbill call types will strongly associate with their own call types. Between 2001 and 2006, less that 1% of Cassia crossbills paired with other call types. Compared to the red crossbill call types, which are opportunistic breeders throughout most of the year, the Cassia