This last weekend I decided to visit the mudflats of Panama Viejo in Panama City to check the over-summering shorebirds there. Most of the shorebirds and gulls present in that site already migrated back to their breeding grounds in the north, but a substantial number spent the summer in these beaches, enjoying the tropical sun... usually immatures and non-breeding individuals (thus contrasting with our resident species that are busy with their nesting activities or feeding young). For my surprise, I found some stragglers still hanging around the place. The first one was this Franklin's Gull:
This bird is in full alternate plumage... a real beauty! The wing pattern, stocky shape, short bill and legs and prominent white eye-crescents separate it from the superficially similar Laughing Gulls, which are abundant even at this time of the year. The bulk of the population migrates through Central America earlier this month, with some extraordinaire movements noticed (check this post for example). As I mentioned, most of the over-summering birds are immatures or in non-breeding plumage, which is the case of most of the Laughing Gulls staying in Panama, like the birds in the next picture:
|Elegant Tern and Laughing Gulls|
All of them are Laughing Gulls, except for the lonely Elegant Tern in the center of the photo. It is also a straggler, but this one is in basic plumage... who knows if is planning to stay longer here. It was first reported during the Global Big Day one week ago... and is still present there.
Other birds are present just shortly during their passage to the breeding grounds. That's the case of the White-rumped Sandpiper. Considered very rare in Panama, it seems regular only for a week or two in mid-May at this site. I only saw one, but the peeps were too far away to see if more were around.
Now the confusing. I noticed this weird warbler behind me working the mid-level of the ornamental Ficus tree at the parking lot of the Visitors Center in Panama Viejo. I have to admit that the first thing that came to my mind was some sort of Parula... but the shape/size and some features of the plumage were wrong.
|Young Yellow "Mangrove" Warbler|
Then, a female Yellow "Mangrove" Warbler came and started to feed the bird... problem solved! No matters how weird it looks, think first in a common bird with atypical features than a vagrant with typical features (this is adapted from an old medical saying). Happy birding!