Showing posts tagged raven

astronomy-to-zoology:

 Thick-billed Raven (Corvus crassirostris)

Is one of the larger Passeriformes (or songbirds) weighing in at 3 lb and 25 in long. it has a distinctively large bill (thus the name thick-billed)  that is slightly curved. it can be found in and around the horn of Africa (Somalia and Ethiopia). they feed like common ravens on insects and grubs and human scraps where available.

Phylogeny

Animalia-Chordata-Aves-Passeriformes-Corvidae-Corvus

(Reblogged from astronomy-to-zoology)
Common Raven (Corvus corax) from Portraits and habits of our birds, prepared by various authors, ed. by T. Gilbert Pearson, illustrated with colored plates, by Louis Agassiz Fuertes, R. Bruce Horsfall, Edmund J. Sawyer, and Allan Brooks. (illustration by R. Bruce Horsfall)

Common Raven (Corvus corax)

from Portraits and habits of our birds, prepared by various authors, ed. by T. Gilbert Pearson, illustrated with colored plates, by Louis Agassiz Fuertes, R. Bruce Horsfall, Edmund J. Sawyer, and Allan Brooks.

(illustration by R. Bruce Horsfall)

A Common Raven (Corvus corax) at Bryce Canyon National Park, UT, USA. (photo: National Park Service) View high resolution

A Common Raven (Corvus corax) at Bryce Canyon National Park, UT, USA.

(photo: National Park Service)

How to tell a raven from a crow

For our friends in the United States and Canada.

(via: Audubon Magazine and Bird Notes on NPR)

NATURE | Ravens - Ravens Playing in Snow

(via: PBS)

* also see: Raven Sliding Down Roof of West Yellowstone Public Library

I just want to remind everyone, that there are several species of raven and many of crow around the world.

If you thought I was just speaking of just the Common Raven and Common Crow (or even considering the NW Crow and Chihuahuan Raven) from North America, then you are mistaken. I was speaking in a broader context across species. I was not limiting myself to North America… because not eveyone lives in North America.

Thank you for your input.

Ravens Capable of Remembering Relationships by PhysOrg staff In daily life we remember faces and voices of several known individuals. Similarly, mammals have been shown to remember calls and faces of known individuals after a number of years. Markus Boeckle and Thomas Bugnyar from the Department of Cognitive Biology of the University of Vienna show in their recent article, published in Current Biology, that ravens differentiate individuals based on familiarity. Additionally, they discovered that ravens memorize relationship valence and affiliation. So far it was unknown whether relationship valence can be remembered based on former positive or negative interactions. As response to calls of formerly known individuals ravens not only increase the number of calls but also change call characteristics dependent on whether they hear former “friends” or “foes”. This suggests that ravens remember specific individuals at least for three years. The ability to change call characteristics is especially interesting: In case they hear a “friendly” individual they respond with a “friendly” call, whereas when listening to a “foe”, they exhibit lower frequencies and rougher characteristics, an effect already described for other animal species… (read more: PhysOrg)       (photo: Markus Boeckle)

Ravens Capable of Remembering Relationships

by PhysOrg staff

In daily life we remember faces and voices of several known individuals. Similarly, mammals have been shown to remember calls and faces of known individuals after a number of years. Markus Boeckle and Thomas Bugnyar from the Department of Cognitive Biology of the University of Vienna show in their recent article, published in Current Biology, that ravens differentiate individuals based on familiarity. Additionally, they discovered that ravens memorize relationship valence and affiliation.

So far it was unknown whether relationship valence can be remembered based on former positive or negative interactions. As response to calls of formerly known individuals ravens not only increase the number of calls but also change call characteristics dependent on whether they hear former “friends” or “foes”. This suggests that ravens remember specific individuals at least for three years.

The ability to change call characteristics is especially interesting: In case they hear a “friendly” individual they respond with a “friendly” call, whereas when listening to a “foe”, they exhibit lower frequencies and rougher characteristics, an effect already described for other …

(read more: PhysOrg)       (photo: Markus Boeckle)

thesealhunter asked: are ravens just big crows or are they actually a separate species/subsecies? (i know i could easily google this but i like to keep you on your toes paxon)

must… refrain… from… sexual innuendo… must…

Crows and Ravens?

Okay, so crows and ravens are both members of the genus Corvus. The larger bodied species of this genus are generally referred to as “raven” and the smaller bodied species are referred to as “crow” (the rook being included with crows). I don’t believe that there are 2 separate lineages here, though some of the species of “raven” may be more closely related to each other than to other species within the genus :3

fairy-wren: Australian Raven (Corvus coronoides) - (photo by dave lj) View high resolution

fairy-wren: Australian Raven (Corvus coronoides) - (photo by dave lj)

(Reblogged from fairy-wren)
The White Ravens of Qualicum Beach, Vancouver Isld, CAN The birds are said not to be “albino,” but “leucistic,” a genetic defect resulting in birds that lack normal pigmentation. (“Albinism” is a result of the reduction of melanin.) They first appeared in Vancouver about 10 years ago, which is now known as the “White Raven Capital of the World.” (via: Vancouver Isld. Birds) View high resolution

The White Ravens of Qualicum Beach, Vancouver Isld, CAN

The birds are said not to be “albino,” but “leucistic,” a genetic defect resulting in birds that lack normal pigmentation. (“Albinism” is a result of the reduction of melanin.) They first appeared in Vancouver about 10 years ago, which is now known as the “White Raven Capital of the World.”

(via: Vancouver Isld. Birds)

(Reblogged from magnifisoup)
featheredprince: INQUISITION by Larry Vienneau

featheredprince: INQUISITION by Larry Vienneau

(Reblogged from dendroica)
electricorchid: The thick-billed raven (Corvus crassirostris) from the Ethiopian Highlands is the largest member of the crow family. These omnivorous birds scavenge everything from carrion to unprotected human food. | +

electricorchid: The thick-billed raven (Corvus crassirostris) from the Ethiopian Highlands is the largest member of the crow family. These omnivorous birds scavenge everything from carrion to unprotected human food. | +

(Reblogged from daydreamering)
blackkittenclan: Digestion by Henry Gunderson  (from FFDG show) View high resolution

blackkittenclan: Digestion by Henry Gunderson  (from FFDG show)

(Reblogged from blackkittenclan)
allcreatures: A red fox walks with a living dace in its mouth past overwintering Japanese red-crowned cranes at Kushiro, Japan. View high resolution

allcreatures: A red fox walks with a living dace in its mouth past overwintering Japanese red-crowned cranes at Kushiro, Japan.

(Reblogged from allcreatures)
 Common Raven (Corvus corax) This large raven found throughout much of the Northern Hemisphere is more frequently found singly, in pairs or small groups, but in many regions is sometimes found in foraging or roosting flocks of several hundred, even several thousand, birds. Polytypic. Length 24” (61 cm). Declined greatly in the 19th and early 20th centuries due to loss of habitat, shooting, poisoning, and disappearance of bison on the Great Plains; extirpated from Alabama, North Dakota, South Dakota, and the southern Great Lakes. Populations are now expanding into some of their former territory in parts of the East, Great Lakes, and northern Plains. Listed as endangered in Tennessee and Kentucky. Shooting, trapping, and habitat degradation continue to pose threats for this species, but it is becoming more tolerant of humans; birds are often found in cities and towns in the West… (read more: National Geo) View high resolution

 Common Raven (Corvus corax)

This large raven found throughout much of the Northern Hemisphere is more frequently found singly, in pairs or small groups, but in many regions is sometimes found in foraging or roosting flocks of several hundred, even several thousand, birds. Polytypic. Length 24” (61 cm). Declined greatly in the 19th and early 20th centuries due to loss of habitat, shooting, poisoning, and disappearance of bison on the Great Plains; extirpated from Alabama, North Dakota, South Dakota, and the southern Great Lakes. Populations are now expanding into some of their former territory in parts of the East, Great Lakes, and northern Plains. Listed as endangered in Tennessee and Kentucky. Shooting, trapping, and habitat degradation continue to pose threats for this species, but it is becoming more tolerant of humans; birds are often found in cities and towns in the West…

(read more: National Geo)