Feb 08 2013

Extinction By Rabbit

Published by at 7:00 am under Beyond Bounds,Tenth Page

Laysan Rail (drawing by Walter Rothschild from Wikimedia Commons)

On Monday I wrote about cats and windmills as threats to bird life but neither of them are the leading reason why birds die.  The number one cause of bird death worldwide is habitat loss.

The Laysan rail, pictured above, went extinct in the 20th century because of habitat loss with a bizarre twist.

Laysan is a small, isolated island in the middle of the Northwestern Hawaiian Island chain.  Only 1 by 1.5 miles across its land area is 1,016 acres, about twice the size of Schenley Park.

Laysan is famous for its bird life, a nesting island for many Pacific seabirds and home of the rare Laysan albatross and even rarer Laysan duck.  It was also the home of the Laysan rail, a fearless, flightless bird less than 6 inches long.

Unfortunately, in 1903 Max Schlemmer released rabbits on the island as a money-making venture.  Instead of making money it was the beginning of the end.  The rabbits on Laysan had no predators and in short order they overran the island.  (Keep in mind that a rabbit can bear 35 young per year.)  The rabbits ate everything.  Everything.

By 1918 Laysan was a barren dustbowl on which only 100 rabbits survived.  With little to eat and no cover the Laysan rail population was hanging on by a thread.  Meanwhile a few rails had been introduced to other islands in the northwestern Hawaiian chain in hopes they could survive elsewhere.

In 1923 the Tanager Expedition eradicated Laysan’s rabbits but it was too late for the rail.  The last two on the island died that year.  A few hung on at other islands in the chain but the final blow fell in 1944 when a World War II ship drifted to shore on Eastern Island, Midway and the ship’s rats swam ashore.  The rats ate the last Laysan rails on earth. That was that.  Extinction.

In the broadest sense, loss of habitat killed the Laysan rail.  In a narrow sense it was a case of extinction by rabbit.

(drawing by Walter Rothschild from Wikimedia Commons. Click on the image to see the original.  Today’s Tenth Page is inspired by page 640 of Ornithology by Frank B. Gill.)

2 responses so far

2 Responses to “Extinction By Rabbit”

  1. Steve-oon 08 Feb 2013 at 9:36 am

    You would think that we would learn our lessons by now. Maybe the next generation will have better luck.

  2. George Bercikon 08 Feb 2013 at 1:13 pm

    Luck isn’t going to get it .Steve-O. Nature has been taking it on the chin for a long time,and it looks like the trend will continue. I believe it will require universal awareness of a planet-wide crisis to overcome greed and ignorance.Then, it may be too late. We, the minority,need to be relentless, in word and action, in an attempt to reverse the slide. Meanwhile,one has to wonder about which present marvels of nature will be unknown to future generations.

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