Re: Mystery Sanpiper at Miranda
Posted: Mon Oct 28, 2019 12:51 pm
Wow, things have been really exciting at Miranda lately! I would have liked to pop in on either Saturday or Sunday evening however the stars did not align. Can certainly see why this bird is raising eye-brows, and hopefully it sticks around for closer photographs and scrutiny. I agree that the only two candidates would have to be Broad-billed or Western Sandpiper. Neither would seem like a slam dunk, however I think one fits better overall.
For me the most telling photo, is the third one posted by David, as that gives a nice impression of the bird in profile. While a water droplet may enhance things a bit, the straightish bill with a sudden droop at the end seems like classic Broad-billed to me. Westerns tend to have more evenly curved bills, or at least starting half way along the bill rather than right at the end. The steep loral angle (where the eye-stripe angles up from the base of the bill to the eye, rather than in line), while maybe not diagnostic, is something I associate more with Broad-billed Sandpiper facial expression, and the dark crown spots also seem more like a Broad-billed feature than the more fine striping that is typical of Westerns in similar plumage. Looking at the 2nd and 4th photos in David's set, there also seems to be a very faint (but present) split supercilium. Looking online, this faded crown pattern is not necessarily rare in Broad-billed. In regards to the bill size and shape, we do need to keep in mind, that like Westerns, Broad-bills can show a range of bill lengths and widths related to sex and age. I would be interested if anyone has any good photos of last summer's Broad-billed Sandpiper from Miranda--as maybe this is the same bird returned? Finally, while leg colour is useful, most Broad-billed Sandpipers in the field appear to show grey-black legs (See Ian's photos above)--usually no where near as obvious as the green legs in many field guides. With mud-stains and bad lighting, I would be wary of making a call based on legs alone.
Would love this to be a Western though! Haven't seen one in 5 years, so have send this thread to some friends in BC in case they can make any definitive remarks.
With the great birds popping up around the country (e.g. Whanganui and Ellesmere), hopefully it draws a few extra scopes down to local estuaries!
Russ C
Indoors in Morrinsville, NZ
For me the most telling photo, is the third one posted by David, as that gives a nice impression of the bird in profile. While a water droplet may enhance things a bit, the straightish bill with a sudden droop at the end seems like classic Broad-billed to me. Westerns tend to have more evenly curved bills, or at least starting half way along the bill rather than right at the end. The steep loral angle (where the eye-stripe angles up from the base of the bill to the eye, rather than in line), while maybe not diagnostic, is something I associate more with Broad-billed Sandpiper facial expression, and the dark crown spots also seem more like a Broad-billed feature than the more fine striping that is typical of Westerns in similar plumage. Looking at the 2nd and 4th photos in David's set, there also seems to be a very faint (but present) split supercilium. Looking online, this faded crown pattern is not necessarily rare in Broad-billed. In regards to the bill size and shape, we do need to keep in mind, that like Westerns, Broad-bills can show a range of bill lengths and widths related to sex and age. I would be interested if anyone has any good photos of last summer's Broad-billed Sandpiper from Miranda--as maybe this is the same bird returned? Finally, while leg colour is useful, most Broad-billed Sandpipers in the field appear to show grey-black legs (See Ian's photos above)--usually no where near as obvious as the green legs in many field guides. With mud-stains and bad lighting, I would be wary of making a call based on legs alone.
Would love this to be a Western though! Haven't seen one in 5 years, so have send this thread to some friends in BC in case they can make any definitive remarks.
With the great birds popping up around the country (e.g. Whanganui and Ellesmere), hopefully it draws a few extra scopes down to local estuaries!
Russ C
Indoors in Morrinsville, NZ