Have We Ever Seen Evolution Happen? - 12 Days of Evolution #3
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[MUSIC] [BIRD CHIRP] Male crickets love to sing. But on the Hawaiian island of Kauai, that singing comes with a price. Several years ago, a parasitic fly arrived on the island. Those flies listen for crickets’ chirping wings, lay eggs inside them, and the crickets are devoured from within. Thanks to these flies, Kauai’s crickets almost disappeared, except for a few. These survivors were missing the ridges that crickets normally rub together to chirp, and today Kauai is filled with quiet crickets. Silence saved their lives. This wasn’t just a change in behavior. The silent wing shape was caused by a mutation on the cricket’s X chromosome. Kauai’s crickets became the strong silent type in fewer than 20 generations. Not only did we see natural selection...
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[MUSIC] [BIRD CHIRP] Male crickets love to sing. But on the Hawaiian island of Kauai, that singing comes with a price. Several years ago, a parasitic fly arrived on the island. Those flies listen for crickets’ chirping wings, lay eggs inside them, and the crickets are devoured from within. Thanks to these flies, Kauai’s crickets almost disappeared, except for a few. These survivors were missing the ridges that crickets normally rub together to chirp, and today Kauai is filled with quiet crickets. Silence saved their lives. This wasn’t just a change in behavior. The silent wing shape was caused by a mutation on the cricket’s X chromosome. Kauai’s crickets became the strong silent type in fewer than 20 generations. Not only did we see natural selection...
