Then, when the chicks are old enough to walk, the parent birds suddenly leave their young behind and fly to another part of the lake, where the blue - green algae are richer and more abundant.
Kui pojad on juba piisavalt suured ja pesast lahkunud, jätavad vanalinnud nad maha ja lendavad soodajärve teise ossa, kus leidub rohkem sini - rohevetikaid.