拥有更为原始的羽毛的恐龙，当初可能将其用于调节身体温度、伪装和发出视觉信号，而非辅助飞行。
It could be that dinosaurs with more primitive feathers used them for temperature regulation, camouflage and visual signaling, rather than flight.
拥有更为原始的羽毛的恐龙，当初可能将其用于调节身体温度、伪装和发出视觉信号，而非辅助飞行。
It could be that dinosaurs with more primitive feathers used them for temperature regulation, camouflage and visual signaling, rather than flight.
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