RE: [nysbirds-l] Successful Raven Fledge in Bronx

2012-04-27 Thread Kevin J. McGowan 
No, Common Ravens have never been recorded having helpers.  Pairs are intensely 
territorial and their offspring leave in their first summer.

American Crows are odd in being cooperative breeders.  None of the other crows 
or raven are, except for a few populations of the Carrion Crow (in Spain).  
Many of the New World jays are cooperative breeders, as are some of the Asian 
green and blue "magpies" (but not THE magpie).

Kevin



From: Richard Guthrie [mailto:gael...@capital.net]
Sent: Friday, April 27, 2012 5:44 AM
To: Kevin J. McGowan; 'Jack Rothman'; NYSBIRDS-L
Subject: RE: [nysbirds-l] Successful Raven Fledge in Bronx

Good Morning;
As with other corvids, do ravens sometimes find extended family (or outsiders?) 
joining a nesting pair to "help" during the fledgling nest stages?
If so, the third bird may be a visiting "parent".
Rich Guthrie
New Baltimore,
The Greening County
New York
gael...@capital.net<mailto:gael...@capital.net>

From: 
bounce-51391037-8863...@list.cornell.edu<mailto:bounce-51391037-8863...@list.cornell.edu>
 [mailto:bounce-51391037-8863...@list.cornell.edu] On Behalf Of Kevin J. McGowan
Sent: Wednesday, April 25, 2012 6:11 PM
To: Jack Rothman; NYSBIRDS-L
Subject: RE: [nysbirds-l] Successful Raven Fledge in Bronx

Very cool observations.  But, the timing doesn't sound quite right.  Richard 
wrote that he thought the nest was compete around 24 February.  If we assume 
that the clutch was being laid then, an incubation start on 28 Feb is 
reasonable, and pretty close to the very few New York raven pairs for which 
I've seen data.  An incubation period of about 19 days would put hatch at 18 
March, and chicks should be 38 days old today.  That's about a week shy of a 
normal fledging, and about a month or two before a fledgling would look like a 
raven or be able to fly overhead.  They should be awkward and have tails only 
half-grown at this point.

Did the third raven have a full tail?  IF so, I wonder if it was another adult 
checking out the pair.

Keep watching!

Best,

Kevin

From: 
bounce-51385047-3714...@list.cornell.edu<mailto:bounce-51385047-3714...@list.cornell.edu>
 
[mailto:bounce-51385047-3714...@list.cornell.edu]<mailto:[mailto:bounce-51385047-3714...@list.cornell.edu]>
 On Behalf Of Jack Rothman
Sent: Wednesday, April 25, 2012 5:52 PM
To: NYSBIRDS-L
Subject: [nysbirds-l] Successful Raven Fledge in Bronx

I went over to check on the raven's nest discovered by Richard Aracil today at 
4PM today and first saw no activity at the nest. I scanned the surrounding 
areas looking for the birds after standing around craning my neck, watching the 
enclosure that houses the water tank, for close to an hour.
When I looked up again, I saw three ravens fly over the building that houses 
the nest.  I was not able to get a photo but I definitely saw 3 ravens.  I 
tried to locate the birds but they probably landed on one of the areas on the 
building that was not visible. The buildings in Coop City are quite high and 
the angle from the ground to the top are sharp, so visibility on the top is 
difficult.
I believe this fledge is a record for the Bronx. The building is located at 120 
Elgar Place, building 34
Jack Rothman
Bronx, NY
www.cityislandbirds.com<http://www.cityislandbirds.com>

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RE: [nysbirds-l] Successful Raven Fledge in Bronx

2012-04-27 Thread Richard Guthrie 
Good Morning;

As with other corvids, do ravens sometimes find extended family (or
outsiders?) joining a nesting pair to "help" during the fledgling nest
stages?

If so, the third bird may be a visiting "parent". 

Rich Guthrie

New Baltimore,

The Greening County

New York

gael...@capital.net

 

From: bounce-51391037-8863...@list.cornell.edu
[mailto:bounce-51391037-8863...@list.cornell.edu] On Behalf Of Kevin J.
McGowan
Sent: Wednesday, April 25, 2012 6:11 PM
To: Jack Rothman; NYSBIRDS-L
Subject: RE: [nysbirds-l] Successful Raven Fledge in Bronx

 

Very cool observations.  But, the timing doesn't sound quite right.  Richard
wrote that he thought the nest was compete around 24 February.  If we assume
that the clutch was being laid then, an incubation start on 28 Feb is
reasonable, and pretty close to the very few New York raven pairs for which
I've seen data.  An incubation period of about 19 days would put hatch at 18
March, and chicks should be 38 days old today.  That's about a week shy of a
normal fledging, and about a month or two before a fledgling would look like
a raven or be able to fly overhead.  They should be awkward and have tails
only half-grown at this point.

 

Did the third raven have a full tail?  IF so, I wonder if it was another
adult checking out the pair.

 

Keep watching!

 

Best,

 

Kevin

 

From: bounce-51385047-3714...@list.cornell.edu
[mailto:bounce-51385047-3714...@list.cornell.edu] On Behalf Of Jack Rothman
Sent: Wednesday, April 25, 2012 5:52 PM
To: NYSBIRDS-L
Subject: [nysbirds-l] Successful Raven Fledge in Bronx

 

I went over to check on the raven's nest discovered by Richard Aracil today
at 4PM today and first saw no activity at the nest. I scanned the
surrounding areas looking for the birds after standing around craning my
neck, watching the enclosure that houses the water tank, for close to an
hour. 

When I looked up again, I saw three ravens fly over the building that houses
the nest.  I was not able to get a photo but I definitely saw 3 ravens.  I
tried to locate the birds but they probably landed on one of the areas on
the building that was not visible. The buildings in Coop City are quite high
and the angle from the ground to the top are sharp, so visibility on the top
is difficult.

I believe this fledge is a record for the Bronx. The building is located at
120 Elgar Place, building 34

Jack Rothman

Bronx, NY

www.cityislandbirds.com

 

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RE: [nysbirds-l] Successful Raven Fledge in Bronx

2012-04-27 Thread Richard Guthrie 
Good Morning;

As with other corvids, do ravens sometimes find extended family (or
outsiders?) joining a nesting pair to help during the fledgling nest
stages?

If so, the third bird may be a visiting parent. 

Rich Guthrie

New Baltimore,

The Greening County

New York

gael...@capital.net

 

From: bounce-51391037-8863...@list.cornell.edu
[mailto:bounce-51391037-8863...@list.cornell.edu] On Behalf Of Kevin J.
McGowan
Sent: Wednesday, April 25, 2012 6:11 PM
To: Jack Rothman; NYSBIRDS-L
Subject: RE: [nysbirds-l] Successful Raven Fledge in Bronx

 

Very cool observations.  But, the timing doesn't sound quite right.  Richard
wrote that he thought the nest was compete around 24 February.  If we assume
that the clutch was being laid then, an incubation start on 28 Feb is
reasonable, and pretty close to the very few New York raven pairs for which
I've seen data.  An incubation period of about 19 days would put hatch at 18
March, and chicks should be 38 days old today.  That's about a week shy of a
normal fledging, and about a month or two before a fledgling would look like
a raven or be able to fly overhead.  They should be awkward and have tails
only half-grown at this point.

 

Did the third raven have a full tail?  IF so, I wonder if it was another
adult checking out the pair.

 

Keep watching!

 

Best,

 

Kevin

 

From: bounce-51385047-3714...@list.cornell.edu
[mailto:bounce-51385047-3714...@list.cornell.edu] On Behalf Of Jack Rothman
Sent: Wednesday, April 25, 2012 5:52 PM
To: NYSBIRDS-L
Subject: [nysbirds-l] Successful Raven Fledge in Bronx

 

I went over to check on the raven's nest discovered by Richard Aracil today
at 4PM today and first saw no activity at the nest. I scanned the
surrounding areas looking for the birds after standing around craning my
neck, watching the enclosure that houses the water tank, for close to an
hour. 

When I looked up again, I saw three ravens fly over the building that houses
the nest.  I was not able to get a photo but I definitely saw 3 ravens.  I
tried to locate the birds but they probably landed on one of the areas on
the building that was not visible. The buildings in Coop City are quite high
and the angle from the ground to the top are sharp, so visibility on the top
is difficult.

I believe this fledge is a record for the Bronx. The building is located at
120 Elgar Place, building 34

Jack Rothman

Bronx, NY

www.cityislandbirds.com

 

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RE: [nysbirds-l] Successful Raven Fledge in Bronx

2012-04-27 Thread Kevin J. McGowan 
No, Common Ravens have never been recorded having helpers.  Pairs are intensely 
territorial and their offspring leave in their first summer.

American Crows are odd in being cooperative breeders.  None of the other crows 
or raven are, except for a few populations of the Carrion Crow (in Spain).  
Many of the New World jays are cooperative breeders, as are some of the Asian 
green and blue magpies (but not THE magpie).

Kevin



From: Richard Guthrie [mailto:gael...@capital.net]
Sent: Friday, April 27, 2012 5:44 AM
To: Kevin J. McGowan; 'Jack Rothman'; NYSBIRDS-L
Subject: RE: [nysbirds-l] Successful Raven Fledge in Bronx

Good Morning;
As with other corvids, do ravens sometimes find extended family (or outsiders?) 
joining a nesting pair to help during the fledgling nest stages?
If so, the third bird may be a visiting parent.
Rich Guthrie
New Baltimore,
The Greening County
New York
gael...@capital.netmailto:gael...@capital.net

From: 
bounce-51391037-8863...@list.cornell.edumailto:bounce-51391037-8863...@list.cornell.edu
 [mailto:bounce-51391037-8863...@list.cornell.edu] On Behalf Of Kevin J. McGowan
Sent: Wednesday, April 25, 2012 6:11 PM
To: Jack Rothman; NYSBIRDS-L
Subject: RE: [nysbirds-l] Successful Raven Fledge in Bronx

Very cool observations.  But, the timing doesn't sound quite right.  Richard 
wrote that he thought the nest was compete around 24 February.  If we assume 
that the clutch was being laid then, an incubation start on 28 Feb is 
reasonable, and pretty close to the very few New York raven pairs for which 
I've seen data.  An incubation period of about 19 days would put hatch at 18 
March, and chicks should be 38 days old today.  That's about a week shy of a 
normal fledging, and about a month or two before a fledgling would look like a 
raven or be able to fly overhead.  They should be awkward and have tails only 
half-grown at this point.

Did the third raven have a full tail?  IF so, I wonder if it was another adult 
checking out the pair.

Keep watching!

Best,

Kevin

From: 
bounce-51385047-3714...@list.cornell.edumailto:bounce-51385047-3714...@list.cornell.edu
 
[mailto:bounce-51385047-3714...@list.cornell.edu]mailto:[mailto:bounce-51385047-3714...@list.cornell.edu]
 On Behalf Of Jack Rothman
Sent: Wednesday, April 25, 2012 5:52 PM
To: NYSBIRDS-L
Subject: [nysbirds-l] Successful Raven Fledge in Bronx

I went over to check on the raven's nest discovered by Richard Aracil today at 
4PM today and first saw no activity at the nest. I scanned the surrounding 
areas looking for the birds after standing around craning my neck, watching the 
enclosure that houses the water tank, for close to an hour.
When I looked up again, I saw three ravens fly over the building that houses 
the nest.  I was not able to get a photo but I definitely saw 3 ravens.  I 
tried to locate the birds but they probably landed on one of the areas on the 
building that was not visible. The buildings in Coop City are quite high and 
the angle from the ground to the top are sharp, so visibility on the top is 
difficult.
I believe this fledge is a record for the Bronx. The building is located at 120 
Elgar Place, building 34
Jack Rothman
Bronx, NY
www.cityislandbirds.comhttp://www.cityislandbirds.com

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RE: [nysbirds-l] Successful Raven Fledge in Bronx

2012-04-25 Thread Kevin J. McGowan 
Very cool observations.  But, the timing doesn't sound quite right.  Richard 
wrote that he thought the nest was compete around 24 February.  If we assume 
that the clutch was being laid then, an incubation start on 28 Feb is 
reasonable, and pretty close to the very few New York raven pairs for which 
I've seen data.  An incubation period of about 19 days would put hatch at 18 
March, and chicks should be 38 days old today.  That's about a week shy of a 
normal fledging, and about a month or two before a fledgling would look like a 
raven or be able to fly overhead.  They should be awkward and have tails only 
half-grown at this point.

Did the third raven have a full tail?  IF so, I wonder if it was another adult 
checking out the pair.

Keep watching!

Best,

Kevin

From: bounce-51385047-3714...@list.cornell.edu 
[mailto:bounce-51385047-3714...@list.cornell.edu] On Behalf Of Jack Rothman
Sent: Wednesday, April 25, 2012 5:52 PM
To: NYSBIRDS-L
Subject: [nysbirds-l] Successful Raven Fledge in Bronx

I went over to check on the raven's nest discovered by Richard Aracil today at 
4PM today and first saw no activity at the nest. I scanned the surrounding 
areas looking for the birds after standing around craning my neck, watching the 
enclosure that houses the water tank, for close to an hour.
When I looked up again, I saw three ravens fly over the building that houses 
the nest.  I was not able to get a photo but I definitely saw 3 ravens.  I 
tried to locate the birds but they probably landed on one of the areas on the 
building that was not visible. The buildings in Coop City are quite high and 
the angle from the ground to the top are sharp, so visibility on the top is 
difficult.
I believe this fledge is a record for the Bronx. The building is located at 120 
Elgar Place, building 34
Jack Rothman
Bronx, NY
www.cityislandbirds.com

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