The viewpoint in this article is only a little experience and lesson of identification, and can only be used as a reference for teachers in identification. The following combined pictures illustrate the difference between the three species of birds in the family Officinalis, such as the Northern Grey Wagtail, the Squid, and the Grey-striped Crane:
1. Northern Grey Wagtail
1 figure is the Northern Grey Wren, there should be no objection.
Northern Grey Wren
Because it has the main characteristics described in the "Manual": the mouth is long, the lower mouth base is yellow; the eye circles are white, the eyes are white first; there is no half-neck ring; the lower body is white, the thorax side is gray-brown, and so on.
2 The figure should be the Northern Grey Wagtail, misjudged as a blackbird, why is it misjudged?
The reasons for the misjudgment are: (1) the mouth, although the lower mouth base is yellow, but it is rare, and the lower mouth base of the crow is sometimes a little yellow; (2) the chest and two sides are grayer, much like the darker blackbird with the lower body color. Mainly the above two points caused by misjudgment.
3 Figure has a half-neck ring, is it the Northern Grey Wagtail or the Black Wren?
The mouth is long , the base of the lower mouth is yellow , and is almost half of the lower mouth ; the lower body is white , the thorax and both sides are gray-brown ; it should be the northern gray wren. The Manual says that the Northern Grey Grebe does not have a half-neck ring and does not appear to be very reliable.
4 Figure mainly studies: the length from the end of the flight feather to the end of the tertiary flight feather, referred to as "wing length". The length from the end of the tail feather to the end of the tail covert, referred to as "tail length". The relationship between wing length and tail length.
Handbook Northern Grey Wren: The wing tip extends to the middle of the tail. What does this mean! Understanding after research: Northern Grey Wren "wing length" ≯ (not greater than) "tail length". Please compare the above four diagrams. This is not the case with the black wren, which is "wing length" and "tail length".
Second, the black wren
1 The "wing length" of the crow is greater than the "tail length", "Manual" the crow: the wing length to 2/3 of the tail. How to understand this sentence?
Squid
2 A plough anointed rain teacher photographed the black wren, "wing length > "tail length"; even if you only look at the back, you can judge that it is a black bird.
The same bird, the slice of the lower abdomen, the squid should have no objection.
3 Crow juvenile birds, "wing length" > "tail length", which is a characteristic of the black wren throughout the growth process. The crow is a juvenile bird with wings longer than the tail length; the northern greybird is a juvenile bird with a wing length equal to the tail length. Please compare.
Crow Juvenile Bird:
Crows are juvenile birds
Northern Grey Wren Juvenile Bird:
Northern Grey Wagtail Juvenile Bird
3. Grey-striped Grebe
Handbook Grey Wren: Wing length, a few to the tail end. How is this sentence understood? Studies have found that gray-striped grebes: "wing length" is almost twice the "tail length".
Grey-striped grebe
<h2 class="pgc-h-arrow-right" > summary:</h2>
Northern Grey Wren, Black Wren and Grey Wren Identification:
The "wing length" of the Northern Grey Wren is not longer than the "tail length";
The "wing length" of the black wren is longer than the "tail length";
The "wing length" of the grey-striped grebe is almost twice the "tail length".
Feeling: The northern grey wren tail is the longest; the black wren is second; the gray striped wren tail is the shortest.
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