I have a bucket with water in my garden growing pond weed for my fish tank. There are no ponds in any of the gardens on my street, and the nearest body of water is a river, 400m away through multiple streets, yet there are now molluscs and aquatic insects swimming around the bucket that weren’t there to start. How did these creatures get there?
In: Biology
Eggs and larvae might stick to a bird’s feet. When they visit your bucket, some of those fall off and get left behind.
Some of the insects might have flown in themselves.
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