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American Bullfrog predation on birds
Topic Started: Jun 26 2012, 11:57 AM (5,152 Views)
Vivyx
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Felines, sharks, birds, arthropods
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Ceratodromeus
Jan 25 2017, 04:53 AM
FIELD OBSERVATIONS OF BULLFROG (RANA CATESBEINA) PREY IN BRITISH COLUMBIA
"The bullfrog (Rana catesbeina) is British Columbia’s
largest anuran and spends most of its life in the water where
it breeds and hunts. It is well known that adult bullfrogs
are voracious predators and will eat virtually anything that
moves and can be stuffed into their mouths. Their diet in
North America includes snakes, fishes, frogs, salamanders,
small turtles, small mammals, young waterfowl, marsh
birds, songbirds, crayfishes, and a wide variety of aquatic
invertebrates. They are also cannibalistic, eating both their
own tadpoles and other adults and juveniles (Bury and
Whelan 1985; Conant and Collins 1991; Albright 1999).
The seasonal and regional diet of the bullfrog in British
Columbia is unknown. General prey groups mentioned for
the province include young birds, mice, fishes, and smaller
bullfrogs (Green and Campbell 1984). The purpose of this
note is to document two field observations of prey species
and list other animals known to be preyed upon by the
bullfrog in British Columbia.
While photographing the introduced slider (Trachemys
scripta) at Jerry Sulina Park in Maple Ridge on 29 July
2004, a juvenile Solitary Sandpiper (Tringa solitaria) landed
on the water plants and began foraging (Figure 1). The rural
park includes a small meandering stream with permanent,
but shallow, backwater ponds that contain small patches
of the white water-lily (Nuphar odorata), and floating logs
and wooden platforms. The sandpiper was feeding on snails
and large flying insects on the underside of curled waterlily
leaves. The shorebird was watched feeding for about 15
minutes while it moved from the centre of the pond towards
the shore where it was within range to photograph. While
the Solitary Sandpiper was slowly stalking an insect an
adult bullfrog suddenly grabbed the bird and disappeared
underwater. I waited unsuccessfully for about 35 minutes
hoping that something might appear on the nearby water
surface. I rechecked the patch of water-lilies the following
morning but found nothing but more adult and juvenile
bullfrogs lurking beneath the cover of water-lily leaves.
On 14 August 1996, Glenn Ryder noticed a Rufous
Hummingbird (Selasphorus rufus) flying low over the water
surface at Little Sumas Lake (Goose Lake) near Abbotsford

The bird, likely a female or juvenile, was buzzing back and
forth when suddenly the lake’s surface broke into a splash
and a large bullfrog, with split second timing and mouth
wide open, grabbed the hummingbird from the air, plunged
back into the water, and vanished. The bullfrog leapt at least
0.61 m out of the water to capture the bird.
The Wildlife Data Centre databases, housed by the
Biodiversity Centre for Wildlife Studies in Victoria, include
a wide variety of bullfrog prey previously unpublished
from throughout the Lower Mainland, Sunshine Coast, and
southeastern Vancouver Island. These include: red-legged
frog (Rana aurora) and green frog (Rana clamitans) adults,
juveniles, and tadpoles, bullfrog tadpoles, common garter
snake (Thamnophis sirtalis) young Canada Goose (Branta
canadensis) goslings, Wood Duck (Aix sponsa), Mallard
(Anas platyrhnchos), Gadwall (Anas sterpera), and Bluewinged
Teal (Anas discors) ducklings, Virginia Rail (Rallus
limicola) chicks, American Coot (Fulica americana) chicks,
Spotted Sandpiper (Actitus macularia) chicks, Bushtit
(Psaltriparus minimus), Marsh Wren (Cistothorus palustris),
flycatcher species, European Starling (Sturnus vulgaris)
fledgling, Cedar Waxwing (Bombycilla cedrorum) juvenile,
American Robin (Turdus migratorius) juvenile, Yellow
Warbler (Dendroica petechia), Common Yellowthroat
(Geothlypis trichas), Song Sparrow (Melospiza melodia)
juvenile, Dark-eyed (“Oregon”) Junco (Junco hyemalis
oreganus), Red-winged Blackbird (Agelaius phoeniceus), and
Yellow-headed Blackbird (Xanthocephalus xanthocephalus)
newly fledged young, Pine Siskin (Carduelis pinus),
Townsend’s vole (Microtus townsendii), Pacific water shrew
(Sorex bendirii), and domestic cat (Felis catus). "
http://m.wildlifebc.org/pdfs/1_2_Campbell_Ryder.pdf
Quote:
 
and domestic cat (Felis catus)


Wait, what?

Are these the rabbit-sized bullfrogs established in Vancouver?
Edited by Vivyx, Feb 23 2017, 02:20 AM.
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Ceratodromeus
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Aspiring herpetologist
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I'll have to look into it to see what's going on there, but they'd have to be reaaalllyyy young animals.
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Wyvax
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Herbivore
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It's true. My high school biology teacher told us a horror story of a lady going out to check on her cat. She was hissing and spitting, freaked out as a massive bullfrog was eating all of her kittens one by one.
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Ceratodromeus
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Aspiring herpetologist
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Posted Image

Posted Image

"This adult American Bullfrog is eating a lesser goldfinch that came to drink in an artificial pond in Tehama County."
http://www.californiaherps.com/behavior/froglifehistoryfeeding.html
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Ceratodromeus
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Aspiring herpetologist
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A few i just found :

Posted Image

Posted Image

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