According to investigations at Tunghai University, egrets do not change nesting site in order to avoid natural calamities, but rather because their surrounding food supply runs low or because of human interference.
據東海大學的調查指出，逃避天然災害倒不是鷺鷥換地點營巢的原因，反倒是棲地破壞、食物供應量減少和人為干擾，才是導致「遷地為良」的主因。