look around 05-migration - nyc audubon · raptors of eastern north america. princeton, nj,...

3
look around look around New York City LET THE JOURNEY BEGIN ! Each fall millions of birds make long journeys from summer nesting grounds to lower-latitude wintering grounds. e birds that survive migrate back again each spring. Although some birds of prey remain in one area year-round, most North American hawks, falcons, eagles, ospreys, and harriers migrate when the seasons change. Why Do Birds of Prey Migrate? When the days get shorter and temperatures get cooler, many of the animals eaten by raptors hibernate, migrate, burrow underground, or die. Raptors move to find enough food to eat during the winter. Raptors return north every spring when small mammals, amphibians, reptiles, insects, and birds reappear and can be hunted as food for their young. The Magic of Migration When migrating, birds of prey tend to follow certain routes, or “flyways.” Flyways often follow geographic features, such as mountain chains, rivers, or coastlines. ese features may aid the raptors in navigation. e raptors that fly past New York City are following the Appalachian flyway. ese birds come from the northeastern United States and eastern Canada. Broad-winged hawks, ospreys, and peregrine falcons spend their winters in Central and South America. Red-tailed hawks and bald eagles generally spend their winters in the southern United States. Special wind currents also provide opportunities for soaring, which help the birds power their flight. Updrafts are created when the brisk autumn winds hit ridges and are deflected upward. ese winds provide a cushion of air on which the birds soar. Taking advantage of these updrafts hawks flap their wings less and save energy on their long journeys. Another condition hawks take advantage of is a thermal. e air over clearings, plowed fields, and south-facing mountain slopes is heated by the sun more rapidly than the air over heavily wooded areas. e warmed air rises, and a thermal is created. Raptors seek this rising air, soaring higher and higher until they glide off in the direction of their migration. Again they save energy by not having to flap their wings. UPDRAFTS AND THERMALS ARE ILLUSTRATED ON PAGES TWO AND THREE. New York City Audubon New York City Audubon sized wings wings in ” shape

Upload: others

Post on 20-May-2020

2 views

Category:

Documents


0 download

TRANSCRIPT

Page 1: Look Around 05-Migration - NYC Audubon · Raptors of Eastern North America. Princeton, NJ, Princeton University Press, 2003. • Brian K. Wheeler and William S. Clark. A Photographic

look aroundlook aroundNew York City

LET THE JOURNEY BEGIN!Each fall millions of birds make long journeys fromsummer nesting grounds to lower-latitude wintering grounds. Th e birds that survive migrate back again each spring. Although some birds of prey remain in one area year-round, most North American hawks, falcons, eagles, ospreys, and harriers migrate when the seasons change.

Why Do Birds of Prey Migrate?When the days get shorter and temperatures get cooler, many of the animals eaten by raptors hibernate, migrate, burrow underground, or die. Raptors move to fi nd enough food to eat during the winter. Raptors return north every spring when small mammals, amphibians, reptiles, insects, and birds reappear and can be hunted as food for their young.

The Magic of MigrationWhen migrating, birds of prey tend to follow certain routes, or “fl yways.” Flyways often follow geographic features, such as mountain chains, rivers, or coastlines. Th ese features may aid the raptors in navigation. Th e raptors that fl y past New York City are following the Appalachian fl yway. Th ese birds come from the northeastern United States and eastern Canada. Broad-winged hawks, ospreys, and peregrine falcons spend their winters in Central and South America. Red-tailed hawks and bald eagles generally spend their winters in the southern United States.

Special wind currents also provide opportunities for soaring, which help the birds power their fl ight. Updrafts are created when the brisk autumn winds hit ridges and are defl ected upward. Th ese winds provide a cushion of air on which the birds soar. Taking advantage of these updrafts, hawks fl ap their wings less and save energy on their long journeys.

Another condition hawks take advantage of is a thermal. Th e air over clearings, plowed fi elds, and south-facing mountain slopes is heated by the sun more rapidly than the air over heavily wooded areas. Th e warmed air rises, and a thermal is created. Raptors seek this rising air, soaring higher and higher until they glide off in the direction of their migration. Again they save energy by not having to fl ap their wings.

UPDRAFTS AND THERMALS ARE ILLUSTRATED ON PAGES TWO AND THREE.

New York City Audubon New York City Audubon New York City Audubon

a cushion of air on which the birds soar. Taking advantage of these updrafts,

Osprey

• Large, eagle-sized • Large, eagle-sized raptor

• Long, slender wings• Long, slender wings

• Often holds wings in • Often holds wings in a crooked “M” shapea crooked “M” shape

Red-tailed hawk

Bald eagle

Broad-wingedhawk

Osprey

Page 2: Look Around 05-Migration - NYC Audubon · Raptors of Eastern North America. Princeton, NJ, Princeton University Press, 2003. • Brian K. Wheeler and William S. Clark. A Photographic

2 Look Around New York City Look Around New York City Look Around New York City New York City Audubon 3

TO LEARN MORE ABOUT HAWK MOUNTAIN SANCTUARY, RAPTORS, AND RAPTOR MIGRATION GO TO WWW.HAWKMOUNTAIN.ORG.

HAWK MOUNTAIN SANCTUARYHAWK MOUNTAIN SANCTUARYHAWK MOUNTAIN SANCTUARY

H awk Mountain Sanctuary was established in 1934 as the

world’s fi rst sanctuary for raptors. Each autumn, 16 species of raptors follow ridges of the central Appalachian Mountains as they fl y south. Th is makes Hawk Mountain a great place to see migrating raptors.

People used to believe that People used to believe that killing predators was a good thing. Th ey thought that if they shot raptors there would be more songbirds, game animals, and farm animals. Since then, we have learned that predators are important parts of our ecosystems.

Rosalie Edge, a conservationist from New York, decided to stop the people who were shooting migrating raptors from high points along the Kittatinny Ridge in Pennsylvania. She bought the land that is now Hawk Mountain Sanctuary. She hired Maurice Broun to take care of the land and to stop the shooting. In late September Maurice went to

Rosalie Edge, a conservationist from New York, decided to stop the people who were shooting migrating raptors from high points along the Kittatinny Ridge in Pennsylvania. She bought the land that is now Hawk Mountain

American Kestrel

• Small and colorful• Small and colorful

• Double mustache marks • Double mustache marks on side of headon side of head

• Long, sickle-shaped wings• Long, sickle-shaped wings

• Fluttery in fi lght• Fluttery in fi lght

Red-tailed HawkRed-tailed Hawk

• Long, broad wings• Long, broad wings

• Light underwings with dark • Light underwings with dark patagial markings and wrist patagial markings and wrist commascommas

• Many have a dark belly band• Many have a dark belly band

the North Lookout and began counting migrating raptors. Soon people started hunting the skies with binoculars instead of guns. Today Hawk Mountain continues to count, study, and teach people about raptors. Each year more than 70,000 visitors from around the 70,000 visitors from around the world come to the Sanctuary to watch migrating raptors.

Updrafts

Thermals

HAWK MOUNTAIN SANCTUARYHAWK MOUNTAIN SANCTUARY

people started hunting the skies

count, study, and teach people about raptors. Each year more than 70,000 visitors from around the 70,000 visitors from around the world come to the Sanctuary to

Peregrine Falcon

• Dark mustache mark on side of head

• Long, tapered wings

• Flies with steady, fl uid • Flies with steady, fl uid wingbeats

Hawk MountainHawk Mountain

North Lookout Kittatin

ny R

idge

Sharp-shinned Hawk

• Square-tipped tail

• Head does not stick out much since leading edge of the wings usually pushes forward of elbowpushes forward of elbow

Page 3: Look Around 05-Migration - NYC Audubon · Raptors of Eastern North America. Princeton, NJ, Princeton University Press, 2003. • Brian K. Wheeler and William S. Clark. A Photographic

4 Look Around New York City Look Around New York City Look Around New York City

Copyright © 2005New York City Audubon71 West 23 StreetNew York, NY 10010212-691-7483

[email protected]

Naola Gersten-Woolf: Publisher & Managing Editor; Editor

Cecelia Rogers:Art Director

E.J. McAdams:Executive Director

WHAT MAKES HAWKS SO SPECIAL?

My name is Alysyn Reinhardt and I am 11 years old. I love nature. Nature reminds me of the colors green and blue (my favorite colors). I thought that writing an article on hawks would be a lot of fun and I was right.

I like hawks because there are so many diff erent kinds. Many people think that hawks only live in deserts, but there are some in New York City too!

Colors of hawks vary. Th ey can be gray, brown, red, and in some instances they are black. Th eir wing spans range from 43 to 56 inches! Th at’s bigger than me!

I love the way hawks fl y. When they fl y, they soar like a kite. It enables them to drop slowly to pick up their prey. Th ey have great vision to see their prey with. Th eir vision is better then humans!

Smaller hawks mostly eat beetles or worms. Bigger hawks mostly eat rodents and other birds. Sometimes once a hawk eats its meal, its crop bulges. A crop is a part of the hawk’s body between its mouth and stomach. If their crop gets bigger that means they’ve stored food that will gradually be released into the stomach. Sometimes they won’t have to eat for two days after that happens!

Hawks are strong creatures, which can live for about 20 years. Some of their young don’t get to live that long, though, because of pollution or predators. Th at’s why I like hawks and it’s why I try not to litter! –AR

OUR THANKS TO:HAWK MOUNTAIN SANCTUARY for providing the technical text and all the illustrations for this issue. JEREMY

SCHEIVERT, Education Specialist, acted as contact and reviewer.

ALYSYN REINHARDT entered Sacred Heart School in Queens in September 2005. She believes that you should always follow your dreams.

Funded by a generous donation from the NEW YORK

CITY RAPTOR FUND.

Look It Up• Alysyn researched her article

on the website http://www.arcytech.org/java/population/facts_hawks.html.

• Brian K. Wheeler. Raptors of Eastern North America. Princeton, NJ, Princeton University Press, 2003.

• Brian K. Wheeler and William S. Clark. A Photographic Guide to North American Raptors.San Diego, Academic Press Ltd., 1995.

Go with a Grownup

• If you know someone with a car you can make a weekend trip to Hawk Mountain Sanctuary. The fall migration happens at the same time as fall foliage season, so you’ll probably need a motel reservation! HMS is in Kempton, Pennsylvania; 610-756-6961.

• In New York City you can see the fall hawk migration from high points in Van Cortlandt Park (The Bronx), Inwood Hill Park (Manhattan) and from the Belvedere in Central Park. For more exact information call 311 and ask for the Urban Park Rangers or check the NYC web site at www.nyc.gov/parks.

• Floyd Bennett Field (Brooklyn) in Gateway National Recreation Area has open fi elds where you can see hawks. Call 718-338-3799 or visit the National Park Service website at www.nps.gov/gate.

Smaller hawks mostly eat beetles or worms. Bigger hawks mostly eat rodents and other birds. Sometimes once a hawk eats its meal, its crop bulges. A crop is a part of the hawk’s body between its mouth and stomach. If their crop gets bigger that means they’ve

stomach. Sometimes they won’t have to eat for two days

Hawks are strong creatures, which can live for about 20 years. Some of their young don’t get to live that long, though, because of pollution or predators. Th at’s

–AR

OUR THANKS TO:OUR THANKS TO: for providing the technical

• If you know someone with a car you can make a weekend trip to Hawk Mountain Sanctuary. The fall migration happens at the same time as fall foliage season, so you’ll probably need a motel reservation! HMS is in Kempton, Pennsylvania; 610-756-6961.

• In New York City you can see the fall hawk migration from

Broad-winged Hawk

• Light underwings with a dark border

• Wide black and white tail bands

• Wings are shaped like a candle fl ame