Flamin_Yon t1_isphunx wrote on October 17, 2022 at 7:00 PM

Reply to comment by Creation98 in TIL eels swim from a lake in Australia through stormwater drains and across the ocean to lay eggs in New Caledonia where they die. Their eggs hatch and make the return journey back to the lake they came from. by Aussiewhiskeydiver

This is completely different in my opinion as the newly hatched eels have literally never been to their destination before and aren't following a river. They just somehow know where to go.

Salmon on the other hand hatch and follow the flow of the river to the ocean, then return to spawn.

PandaMomentum t1_isqzrud wrote on October 18, 2022 at 1:31 AM

Monarch butterflies do this too -- the migration from Mexico to the US and back takes multiple generations. It's the great grandkids that show up in the same forest in Mexico each year. Genetically encoded somehow.