Tuesday, April 14, 2009

#7 Evening Grosbeak vs. #10 White-winged Crossbill

Evening Grosbeak

  • This species is a frequent winter irrupter.
  • Evening Grosbeaks do not have a well developed song that is used for mating and territorial defense.
  • A female Evening Grosbeak once collided with a plane 6200 feet above ground in Colorado. This is 12,468 feet above sea level at this location and is quite high for a songbird to be flying. It is unknown if this is a common height for grosbeaks to fly.
  • These birds have been see eating 96 sunflower seeds in under 5 minutes.
  • They eat a surprisingly large quantity of raw salt.

Click here to view more information on Evening Grosbeaks.

For pictures of Evening Grosbeaks, click here.

White-winged Crossbill

  • A single White-winged Crossbill can eat up to 3,000 conifer seeds each day.
  • White-winged Crossbills do not have a defined breeding season. They are opportunistic and will breed whenever food is readily available. There are breeding records in every month of the year.
  • It is three times more likely for the lower mandible to cross to the right than to the left.
  • White-winged Crossbills go through only one molt per year that usually occurs in the fall. Due to the structure of the feathers, the males look pink right after they molt and do not get their red color until part of the feather wears off.
  • The Hispaniolan Crossbill used to be considered a subspecies of the White-winged Crossbill but it is now considered its own species. It can only be found in the pine forests of Haiti and the Dominican Republic.

Click here to view more information on White-winged Crossbills.

For pictures of White-winged Crossbills, click here.

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