[quote=@SpookySquid]
[b]Antignis (Maybe put this in Character tab?)[/b]

Antignis are giant white birds that look like Geese, about two times the size of a regular human beings. They are uncommon and difficult to tame. Every Antignis has two green feathers on each wing. If the feathers are a dark green, then they can emit a deadly poison cloud, but it can only do this once. If the feathers are a light green, then the Antignis can actually breathe brilliant golden fire. However, the fire is relatively harmless, typically only causing minor burns and is typically used to signal other Antignis.
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First off, if the Antignis can "emit poison", then how would they prevent themselves from breathing it in and poisoning themselves? Just because their body can produce something toxic doesn't mean they can handle it, look at humans and the waste products of food and water.

Second, fire breathing is something purely magic although it does has a real biological possibilities. However, it would require some very sharp and fine motor control on the teeth as well as the production of a natural flammable gas. While O2 might work, it would meant that they wouldn't be as much birds as much as they are flying plant monsters as most multicellular organisms that aren't plants inhale O2 and exhale CO2. Also, you can't really have "relatively harmless" fire; fire is harmful and dangerous by nature.