birding-aus

Fwd: which hawk ?

To: "birding-aus (E-mail)" <>, Judith L-A <>
Subject: Fwd: which hawk ?
From: Kev Lobotomi <>
Date: Wed, 26 Aug 2020 07:19:55 +0000
Square tail=Collared Sparrowhawk.

Sent from Outlook



From: Birding-Aus <> on behalf of Judith L-A via Birding-Aus <>
Sent: Wednesday, 26 August 2020 4:54 PM
To: birding-aus (E-mail) <>
Subject: [Birding-Aus] Fwd: which hawk ?
 

3 tail pix ATTACHED:
- dorsal
- notch (ventral),
 & showing blue wash
- spread = 12 rectrices


---------- Forwarded message ---------
From: Judith L-A <>
Date: Wed, 26 Aug 2020, 8:00 am
Subject: Fwd: which hawk ?
To: Judith L-A <>


Thanks, guys. As you see, the various measurements fall between the 2 species, & I remain uncertain. The bird is in the fridge so I can still photograph it, & will add close-ups of the head, foot & toes, beak, & tail-tip.
Judith


---------- Forwarded message ---------
From: Judithla <>
Date: Mon, 24 Aug 2020, 3:28 pm
Subject: which hawk ?
To: <>


Greetings, all.

Here are measurements for an Accipiter found dead yesterday on the back landing here, beneath a hard-sheltered water bowl frequented by local passerines. These measurements I’ve compared with the following refs (& their diagrams), reaching an uncertain conclusion—
Menkhorst et al, 2017
Simpson & Day, 2004
Debus, 1998
Morcombe, 2000

*
The bird’s neck is broken. In the hand it feels broad-shouldered & “heavy”. Puzzlingly the beak & cere are all-black, with just the slightest whitish thread separating them.

Ventrally, chest-down the bird is finely barred rufous/white. There is a chestnut breast-band > slight dorsal half-collar. Dorsally the bird is brownish grey, & the head slate-grey. Brow-ridges are distinct. Tail is barred with a ventral bluish cast.

Measures are in CENTIMETRES, taken with a retracting metal household tape:

LENGTH  bill>tail-tip 37
WEIGHT  257g

WINGspan 56 ventrally (incl. chest)
  Single wingspread 30 dorsally (longest flight-feather > shoulder joint)

TAIL  appears notched —
  17.5 dorsally (from feather-base), 17 ventrally (from below cloaca)

BILL  1.5 (+cere=2)
Middle TOE  4.4 (incl. claw): appears longer by one-third than the neighbouring two. (Cannot be well-measured due to rigor, & damage.)
*

Two choices... What do you think?

Judith
SEQ 500m
<HR>
<BR> Birding-Aus mailing list
<BR> 
<BR> To change settings or unsubscribe visit:
<BR> http://birding-aus.org/mailman/listinfo/birding-aus_birding-aus.org
</HR>
<Prev in Thread] Current Thread [Next in Thread>
Admin

The University of NSW School of Computer and Engineering takes no responsibility for the contents of this archive. It is purely a compilation of material sent by many people to the birding-aus mailing list. It has not been checked for accuracy nor its content verified in any way. If you wish to get material removed from the archive or have other queries about the archive e-mail Andrew Taylor at this address: andrewt@cse.unsw.EDU.AU