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Search: Posts Made By: jurek
Forum: Bird Taxonomy and Nomenclature Saturday 15th February 2020, 23:49
Replies: 18
Views: 787
Posted By jurek
Actually, for a geneticist it is very difficult...

Actually, for a geneticist it is very difficult to impossible to imagine 'coding' in genes such a complex system as recognizing a complex bird song in the brain of a bird. I think this problem was...
Forum: Bird Identification Q&A Friday 14th February 2020, 23:11
Replies: 27
Views: 887
Posted By jurek
I think it is a House Martin, for example...

I think it is a House Martin, for example pale/white undertail, and a hint of paler underwing coverts on pic 3.

Digital cameras produce such leaks of color that it is fully possible to make...
Forum: Bird Taxonomy and Nomenclature Wednesday 12th February 2020, 20:35
Replies: 18
Views: 787
Posted By jurek
I am not an expert, but this is the broad...

I am not an expert, but this is the broad generalization. However, generalizations are usually full of exceptions.
I am sure any good birder can give some examples of oscines with as simple songs as...
Forum: Bird Identification Q&A Wednesday 12th February 2020, 20:21
Replies: 20
Views: 933
Posted By jurek
If by 'structure' you mean the head and neck...

If by 'structure' you mean the head and neck thickness, then Ryszard's bird is for me fully in the range of Common Crossbills. They are bulky birds, too. It may be that birds in cold weather puff...
Forum: Bird Behaviour Tuesday 11th February 2020, 21:56
Replies: 7
Views: 330
Posted By jurek
I also read a version that the Spur-winged...

I also read a version that the Spur-winged Lapwing has spurs precisely to force ungrateful crocodiles to open their mouths. But my memory could be playing tricks.
Forum: Conservation Tuesday 11th February 2020, 21:50
Replies: 1
Views: 130
Posted By jurek
Cool, but why no article that the animals eating...

Cool, but why no article that the animals eating beech seeds benefited from this aspect of climate warming?
Forum: Bird Identification Q&A Tuesday 11th February 2020, 21:49
Replies: 20
Views: 933
Posted By jurek
The ratio of bill height at the base to length is...

The ratio of bill height at the base to length is closer to 1.5 than 1.1 which would point to Common Crossbill. They are also massive birds. But you can put it on clanga.com or whatever.
Forum: Costa Rica Monday 10th February 2020, 22:57
Replies: 10
Views: 266
Posted By jurek
You don't really need wellies. Concerning...

You don't really need wellies. Concerning snakebite, in La Selva there is enough concrete walking paths and dirt roads to move on.
Forum: Birds & Birding Monday 10th February 2020, 22:54
Replies: 24
Views: 803
Posted By jurek
I did something like this recently. I visited a...

I did something like this recently.
I visited a newly opened nature center, where a nice and knowledgeable lady explained to me what they did, and that one pool is especially created for watching...
Forum: Bird Behaviour Sunday 9th February 2020, 16:02
Replies: 7
Views: 291
Posted By jurek
Yes, it depends of species. I though about Arfak...

Yes, it depends of species. I though about Arfak Bowerbird, but the Shiny Bowerbird, which is most familiar to Australians, prefers blue objects.

I also thought that the fourth option is possible....
Forum: Bird Behaviour Sunday 9th February 2020, 15:55
Replies: 7
Views: 330
Posted By jurek
If it was a regular occurrence, it should be...

If it was a regular occurrence, it should be photographed or filmed many times by now, considering the number of safari tourists.

By the way, it is not even certain what bird was actually meant by...
Forum: Conservation Sunday 9th February 2020, 15:41
Replies: 776
Views: 128,836
Posted By jurek
Dear all, Did you notice that this thread is 4...

Dear all,

Did you notice that this thread is 4 years old? Did you notice any rise of sea level since that time? It should be easy to see on any port construction in any coastal city. Then multiply...
Forum: Canon Saturday 8th February 2020, 12:10
Replies: 6
Views: 360
Posted By jurek
By the way, are you already familiar with...

By the way, are you already familiar with Birdlife Aargau? They have a nice visitor center at Klingnauer Stausee, and south of it a lot of birds can be photographed easily on the public path along...
Forum: Threatened Birds Of The world Saturday 8th February 2020, 00:05
Replies: 15
Views: 4,424
Posted By jurek
On Google Maps it seems to be many forests in the...

On Google Maps it seems to be many forests in the general Algerian Nuthatch breeding area. I wonder if anybody systematically searched for it using satellite maps?
Forum: Birds & Birding Saturday 8th February 2020, 00:03
Replies: 58
Views: 1,277
Posted By jurek
Actually, I would say stronger - repeatedly...

Actually, I would say stronger - repeatedly playing song of a bird (especially by photographers who want a long photo session at the point blank range) easily leads to the bird deserting the area....
Forum: Birds & Birding Friday 7th February 2020, 23:51
Replies: 56
Views: 1,858
Posted By jurek
These databases like ebird indeed create a whole...

These databases like ebird indeed create a whole new range of errors: those made by putting the records wrongly and by glitches in the system. My local database suggests a bird name, but a first name...
Forum: Canon Friday 7th February 2020, 23:46
Replies: 6
Views: 360
Posted By jurek
To make better pictures, you could move your...

To make better pictures, you could move your feeder and put some interesting sticks near it on a good background and in shade (better than direct sun for bird photography). It is even faster than...
Forum: Say Hello Friday 7th February 2020, 00:04
Replies: 8
Views: 175
Posted By jurek
Witaj! Did you meet already Polish birders from...

Witaj!
Did you meet already Polish birders from your region?
Forum: Bird Paleontology Thursday 6th February 2020, 00:30
Replies: 5
Views: 160
Posted By jurek
It is interesting because enantiornithes are said...

It is interesting because enantiornithes are said to fly almost directly after hatching and grow very slowly to adult size. So there should not be much flightless stage? Possibly they were flightless...
Forum: Books, Magazines, Publications, Video & DVD Thursday 6th February 2020, 00:20
Replies: 4
Views: 256
Posted By jurek
Congratulations!

Congratulations!
Forum: Information Wanted Wednesday 5th February 2020, 08:56
Replies: 12
Views: 402
Posted By jurek
Hi Jan, - Double check the conditions - some...

Hi Jan,

- Double check the conditions - some companies either formally or informally allow driving to campsites and sights in national parks on gravel, if no other road exists. Otherwise many...
Forum: Birds & Birding Wednesday 5th February 2020, 08:47
Replies: 56
Views: 1,858
Posted By jurek
It would be interesting to repeat such a study,...

It would be interesting to repeat such a study, but with more sensible bird choice.
Forum: Bird Paleontology Wednesday 5th February 2020, 08:46
Replies: 5
Views: 160
Posted By jurek
I find it interesting that in modern times, birds...

I find it interesting that in modern times, birds get caught in tree resin either never or so rarely that I cannot recall a written comment.
Forum: Morocco Thursday 23rd January 2020, 19:35
Replies: 1
Views: 84
Posted By jurek
Status of sabyi Guineafowl in Morocco

It is generally believed to be extinct since the 1970s, with possible sightings of sabyi-like domestic birds until the 2000s. It is one of endemic Moroccan bird subspecies gone extinct in the last...
Forum: Birds Of Prey Wednesday 22nd January 2020, 19:18
Replies: 11
Views: 629
Posted By jurek
Hobbies regularly eat insects as small as flying...

Hobbies regularly eat insects as small as flying ants, and I guess peregrines do it, too.

However, such tiny morsels they eat on the wing, so it is difficult to find other than in pellets.
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