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Topic: Great Blue Heron

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	IFWIS - Great Blue Heron
		Great blue herons require large tracts of floodplain forest in which to nest and the availability of undisturbed, unpolluted wetlands in which to forage 03,18,19.
		It is suggested that the great blue heron (and other species) has a particular association with the natural floodplain sequence in which lagoons are filled by spring floods on major streams, dry back as summer progresses, and concentrate fish populations as the flood requirements of nestlings reach their peak 03.
		Great blues perfer to nest in extensive tract of bottomland forest and measurements for 28 of the largest extant (or recently) colinies in Illinois is approx.
	www.inhs.uiuc.edu /chf/pub/ifwis/birds/great-blue-heron.html (3248 words)

	Great Blue Heron
		Great blue herons are between 38 and 54 inches in length (Hancock and Kushlan 1984).
		One subspecies of the great blue heron is the great white heron (A.h.
		Great blue herons nest together in colonies, otherwise known as a heronry, and are sensitive to the effects of human disturbances.
	www.geocities.com /Heartland/5960/bheron.html (681 words)

	Birds, Familiar: Great Blue Heron, Life Histories of North American Birds, A.C. Bent
		Herons probably originated in the warmer climates, where they are certainly better represented in species and in numbers; but this species extends its range across the continent and well up into the cooler climate of Canada.
		The great blue heron also nests in large elm trees, selecting one with a very large trunk, and nearly always building at the extremity of a limb, generally a horizontal one, and many are not strong enough to bear the weight of a man, thereby making it exceedingly dangerous to try to approach the nest.
		The attitude of the great blue heron towards other species of herons with which it is associated on its breeding grounds or its feeding grounds is usually one of dignified indifference or haughty disdain.
	home.bluemarble.net /~pqn/ch1-10/gbh.htm (6043 words)

	The Great Blue Heron - At Home on the Bay
		Similarly, great blue herons have been as quick as any bird to capitalize on the upsurge in recent decades of backyard ornamental fish ponds, "pay to fish" recreational lakes, and storm water detention basins, as well as fish hatcheries and fish farming ventures.
		It is a paradox that while most people have seen great blue herons foraging singly for food, very few have been privy to the spectacular, cacophonous group settings of their breeding colonies or witnessed the complex repertoire of courtship and bonding rituals on display there.
		It is estimated only one in five juvenile great blues will survive to breed in their third spring; the biggest reason for such high mortality appears to be the considerable difficulty they experience in learning to catch the large fish.
	www.dnr.state.md.us /naturalresource/winter2002/heron.html (2550 words)

	ADW: Ardea herodias: Information
		Great blue herons have gray upper bodies, and their necks are streaked with white, fl and rust-brown.
		Great blue herons typically breed from March to May in the northern part of their range and November through April in the southern hemisphere.
		Great blue herons fish in both the night and the day, with most of their activity occurring around dawn and dusk.
	animaldiversity.ummz.umich.edu /site/accounts/information/Ardea_herodias.html (1070 words)

	Great Blue Heron--BIOLOGICAL AND ECOTOXICOLOGICAL CHARACTERISTICS OF TERRESTRIAL VERTEBRATE SPECIES RESIDING IN ...
		A GBH sickened from the parasitic roundworm, Eustrongylides ignotus, shot in Oneida County, Wisconsin, was analyzed for organochlorine residues in the brain (Windingstad and Swineford, 1981).
		Great white herons were found to have a mean concentration of 6.7 (2.7-15) µg/g dry weight in feathers of juveniles and 4.7 (1.0-9.1) µg/g dry weight in feathers of nestlings.
		GBH eggs and hatchlings from colonies located near sources of heavy metal pollution by Puget Sound, Washington and Lake Chatcolet, Idaho were collected in 1981 and 1982 and tested for residues in tissues and eggs (Blus et al., 1985).
	www.pwrc.usgs.gov /bioeco/gbheron.htm (8035 words)

	The Great Blue Heron
		The nest of the Blue Heron, in whatever situation it may be placed, is large and flat, externally composed of dry sticks, and matted with weeds and mosses to a considerable thickness.
		Suspecting the Heron to be the depredator, I desired him to watch the place carefully with a gun; which was done, and the result was, that he shot a superb specimen of the present species, in which was found the last gold fish that remained.
		When wounded, the Great Blue Heron immediately prepares for defence, and woe to the man or dog who incautiously comes within reach of its powerful bill, for that instant he is sure to receive a severe wound, and the risk is so much the greater that birds of this species commonly aim at the eye.
	www.audubon.org /bird/BoA/F38_G1g.html (4077 words)

	Great Blue Heron (Site not responding. Last check: 2007-11-06)
		Formerly, the Great White Heron was considered a separate species because of its color, slightly larger size, and restricted saltwater habitat; however it is now considered a color form of the Great Blue Heron.
		Great Blue Herons are often seen stalking meadow voles and shrews in fields.
		Great Blue Herons tend to be permanent residents in the southeast, and along the West Coast as far north as southeastern Alaska.
	www.birds.cornell.edu /BOW/gbheron (630 words)

	the-great-blue-herring
		The Great Blue Heron is a large, graceful, dark gray bird having a white crown, cheeks and throat.
		Great Blue’s not infrequently feed in relatively deep water, in the surf, or along blong neck and keen eyesight.eaches.
		Great Blues do not like to live and have a hard time surviving freezing temperatures, which is why they have a migratory.
	bss.sfsu.edu /geog/bholzman/courses/fall99projects/heron.htm (2798 words)

	Puget Sound Shorelines: Species - Great Blue Heron (Site not responding. Last check: 2007-11-06)
		The large number of fish attracted to eelgrass meadows is the staple of the great blue heron diet.
		In the fall and winter, many great blue herons survive by catching meadow voles - a tiny mouse-like mammal that tunnels in grass.
		Heron foraging for rodents in grassy uplands in the fall.
	www.ecy.wa.gov /programs/sea/pugetsound/species/heron.html (542 words)

	Animal Tracks - Great Blue Heron
		Herons live in fresh or salt water, wherever fish are plentiful.
		I waited as the heron in the photos slowly stalked along until it was near enough for me to get photos of it.
		This arrangement of the toes may give the heron greater stability when it is walking in the deep mud and water it often hunts in.
	www.bear-tracker.com /heron.html (436 words)

	NatureWorks - Great Blue Heron (Site not responding. Last check: 2007-11-06)
		The great blue heron is the largest heron in North America.
		The great blue heron breeds from southern Canada south to the West Indies and Mexico.
		The female great blue heron lays three to seven eggs on a shallow platform made of sticks and twigs and lined with soft material.
	www.nhptv.org /natureworks/greatblueheron.htm (331 words)

	Ecosystem Information
		The Great Blue Heron, the largest heron of North America, is widely distributed in Canada but the estimated 1500 pairs of coastal British Columbia Great Blue Heron are distinct from herons elsewhere in Canada.
		Herons are also susceptible to disturbance from Bald Eagles that prey on chicks and adults in the colonies.
		A nesting heron study conducted in 1999 in the Georgia Basin concluded that Bald Eagles targeting heron eggs or young were responsible for the abandonment of 13 of 31 colonies (Vennesland, 2000).
	www.ecoinfo.ec.gc.ca /env_ind/region/herons/heron_e.cfm (1540 words)

	Habitat - Great Blue Heron (Site not responding. Last check: 2007-11-06)
		This Heron can not fly and so the branches are positioned like a natural ladder for him to climb to the top.
		Great Blue Herons are extremely territorial birds, and they can become very aggressive to another Heron which is why this bird lives alone.
		Great Blue Herons are very large birds (standing nearly four feet tall) and therefore needs a spacious and high habitat.
	www.pelicanman.org /html/Great_Blue_Heron_Habitat.htm (129 words)

	April 2001 Bird of the Month - Great Blue Heron
		The great blue heron is a large, gray-blue bird with a fl stripe that extends above the eye.
		The heron's nest is a crude platform of sticks constructed in a bush or tree, usually in a colony with other herons.
		Herons are "wading birds" and have long legs, neck and bill for stalking food in shallow water.
	www.passporttotexas.com /birds/apr01.html (428 words)

	Great Blue Heron Gallery (Site not responding. Last check: 2007-11-06)
		Then I noticed this great blue heron against the brilliant orange reflection of the sunset and shot a whole sequence as he slowly moved around.
		It's hard to get a sense of how small this young heron is from the picture, but it was noticeably smaller than an adult heron (but still larger than many of the smaller herons like a green heron or the night herons).
		The dead giveaway that this is not an adult, though, is in the head: young herons lack the white stripe that runs the length of the adult's head.
	racphoto.com /Birds/Waders/greatblueheron.html (1011 words)

	Mather Field Vernal Pools - Great Blue Heron
		The Great Blue Heron is a wading bird.
		The Great Blue Heron is a "species of concern", meaning that it could become endangered if this trend continues.
		Herons still come to the vernal pool grasslands after the water has evaporated in the spring when the pools are full of flowers.
	www.sacsplash.org /critters/GBHeron.htm (525 words)

	About the Great Blue Heron — Herons Forever
		The great blue heron, the largest heron of North America, is widely distributed in the United States and Canada but the estimated 1,500 pairs of Blue Heron in the Puget Sound region and extending into coastal British Columbia are distinct from herons elsewhere.
		The herons return to the Black River Riparian Forest every year mid to late January to evaluate the site for nesting. They seem to consistently return and leave en masse several times before they decide to nest here in February. By March, they are in full swing of nesting preparation.
		Herons are particularly sensitive to disturbance while nesting. Scientists suggest as a general rule that there should be no development within 1,000 ft of the edge of a heron colony and no disturbance in or near colonies from March to August.
	www.heronsforever.org /greatblueheron (530 words)

	Habitat Atlas For Wildlife at Risk \| Species Profiles - Great Blue Heron
		Heron colonies are located in groves of large trees along the banks of lakes, slow-moving rivers, sloughs, marshes and ponds in the North Okanagan.
		Herons nest in colonies, or heronries; most colonies are occupied for years.
		Herons patiently wade in calm, shallow waters for fish, frogs, salamanders, snakes, large insects; also seen foraging in meadows and fields for mice and voles.
	wlapwww.gov.bc.ca /sir/fwh/wld/atlas/species/blueheron.html (498 words)

	Great Blue Heron
		The great blue heron is the largest and most common of the North American herons.
		The great blue heron's eggs are generally light blue in color.
		Although great blue herons occasionally nest singly, most breed in localized colonies of up to hundreds of nesting pairs.
	www.ocean.udel.edu /kiosk/bheron.html (223 words)

	All About Birds
		The largest and most widespread heron in North America, the Great Blue Heron can be found along the ocean shore or the edge of a small inland pond.
		The white form of the Great Blue Heron, known as the "great white heron," is found nearly exclusively in shallow marine waters along the coast of very southern Florida, the Yucatan Peninsula, and in the Caribbean.
		Although the Great Blue Heron eats primarily fish, it is adaptable and willing to eat other animals as well.
	birds.cornell.edu /programs/AllAboutBirds/BirdGuide/Great_Blue_Heron.html (331 words)

	The Great Blue Heron (Site not responding. Last check: 2007-11-06)
		By silently waiting in the shallows, the heron is rewarded with the approach of fish, amphibians, and crayfish, which are quickly caught by the spear-like bill.
		The Great Blue Heron uses a wide variety of strategies for hunting food, partially because this heron is found in a wider range of habitats across more of North America than any other heron.
		Many Great Blue Herons migrate south for the winter, but in New England, some stay around if there is open water, and many others head east and over winter along the coast instead.
	www.bio.umass.edu /biology/conn.river/gbh.html (523 words)

	Eco Field Guide: Great blue heron
		It is one of the largest herons in the world and adults reach about one metre in height with a wingspan of nearly two metres.
		Herons generally build their nests in colonies (groups of nests) in large areas of forest a few km's away from their main food source.
		Once the prey is close the heron's long neck extends very quickly and the heron clamps the prey in between its beak.
	www.ecokids.ca /pub/eco_info/topics/field_guide/birds/heron.cfm (389 words)

	Great Blue Heron (Site not responding. Last check: 2007-11-06)
		Great Blue Herons are found all across North America, however, local Pacific Northwest herons are non-migratory and are considered to be genetically distinct from all other populations.
		Herons belong to the order Ciconiiforme, which are wading birds who have long legs, neck and bills, broad rounded wings and short tail.
		Great Blue herons are mature at two years of age but may not breed until their third year.
	www.naturepark.com /gbheron.htm (954 words)

	Great Blue Herons
		Great Blue Herons are the largest birds belonging to the Heron family in North America.
		The most common sight is when the Great Blue Heron stands in a motionless, somewhat dignified position in the shallow waters of a stream, bog or marsh.
		A great blue heron chick is likely to be hatched in aviaries.
	www.great-blue-herons.com (259 words)

	Shrub-Steppe Series: What About Great Blue Herons? (Site not responding. Last check: 2007-11-06)
		Great blue herons nest high in trees in colonies along the Columbia River.
		In the Tri-Cities, a popular spot to view great blue herons is along Highway 240 between Kennewick and Richland in the Yakima Delta.
		Great blue herons are the best known of all the species and the most distinctive because of their size.
	www.pnl.gov /pals/resource_cards/greatblueherons.stm (790 words)

	WDFW - WildWatchCams
		Easily identified by its large body, characteristic profile on the ground or in the air the great blue heron is a common sight near many wetlands, forests and estuaries in Washington.
		The great blue heron is an opportunistic predator eating small fish, shellfish, insects, reptiles and amphibians and even mall mammals and birds.
		Appreciation is extended to Pam Cahn for her dedicated recordings of the heron's activities, and to Don Norman, a consultant and biologist and also officials from King County, Seattle Parks and Recreation, the City of Kenmore and the Kenmore Police.
	www.wdfw.wa.gov /wildwatch/heroncam (781 words)

	Great Blue Heron (Site not responding. Last check: 2007-11-06)
		Great Blue Herons can be seen from March to December in southern Quebec, with the rare straggler heading south only when forced to by ice cover and extreme cold weather.
		Great Blue Herons nest in large colonies; perhaps the largest colony in the world, with over 1000 breeding pairs, is found on La Grande Ile on Lac Saint-Pierre.
		Great Blue Herons are among the largest nesting birds in Quebec, with a standing height of about 60 cm.
	www.redpath-museum.mcgill.ca /Qbp/birds/Specpages/greatblueheron.htm (229 words)

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