Why Butterflies Gather On Tropical Sands.

Millions of dazzling yellow male heliconia butterflies are drawn to South America's tropical rivers, such as the Amazon and Orinoco.

Attracted by the mineral-rich wet sand and puddles, they crowd together on the shore, each one drawing up a solution of minerals and salts through its long, curling proboscis.

During mating, the male butterfly transfers much of his sodium to the female in a sperm package, and he comes to the riverbanks to replenish his supplies. Sodium is essential for the working of their nerves and muscles.

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