Is what tiger heron is this in Fortuna Costa Rica (Please I need help) (1 Viewer)

[birdfinder6104]

 

[THE_FERN]

Probably immature bare-throated, although we can't see the throat to be sure. This because of the dull rather than warmer rufous on the head and neck

 

[njlarsen]

Also the pattern of the stripes (relative width of dark vs pale and overall fine striping) indicates the same.
Niels

 

[Butty]

There is a smidgeon of white visible on the chin which suggests that it may well be feathered there.
I can't immediately find a reference to exactly what relative width of striping distinguishes bare-throated tiger-heron and fasciated tiger-heron - esp if they're not fully juvenile and colder/greyer adult feathering is coming in (presumably it's not rufescent tiger-heron simply on tone of plumage).

 

[njlarsen]

I checked both field guides and photos before writing what I did, and started looking because I remembered an old discussion about these.
Niels

 

[THE_FERN]

There is a smidgeon of white visible on the chin which suggests that it may well be feathered there.
I can't immediately find a reference to exactly what relative width of striping distinguishes bare-throated tiger-heron and fasciated tiger-heron - esp if they're not fully juvenile and colder/greyer adult feathering is coming in (presumably it's not rufescent tiger-heron simply on tone of plumage).

Avoiding to Vallely & Dyer fascinated and rufescent imma are indistinguishable. Both warmer than bare-throated

 

[Butty]

Avoiding to Vallely & Dyer fascinated and rufescent imma are indistinguishable.

They don't put it as strongly as that - and their statement is for juveniles, not for all stages of immaturity. As I said, one may have to consider birds that are not fully juvenile with colder/greyer adult feathering coming in.

 

[birdfinder6104]

There is a smidgeon of white visible on the chin which suggests that it may well be feathered there.
I can't immediately find a reference to exactly what relative width of striping distinguishes bare-throated tiger-heron and fasciated tiger-heron - esp if they're not fully juvenile and colder/greyer adult feathering is coming in (presumably it's not rufescent tiger-heron simply on tone of plumage).

So is it a bare throated tiger heron

 

[Butty]

See above, and take a view!
Welcome to BF 👍🏻

 

[birdfinder6104]

See above, and take a view!
Welcome to BF 👍🏻

Thanks

 

[THE_FERN]

They don't put it as strongly as that - and their statement is for juveniles, not for all stages of immaturity. As I said, one may have to consider birds that are not fully juvenile with colder/greyer adult feathering coming in.

For me this bird is clearly not rufescent enough to be one of the 2 confusion species. V & D's illustrations are of "juvenile" birds but they are near-identical to what we see here. In fact I'm unsure we're seeing much in the way of adult feathering. Much of the cold grey feathering is on the underwing in the photo—not illustrated by V & D but consistent with juvenile plumage in their illustrations. I see the same in the neck feathering too which has little about it to recall the adult's.

 

[Butty]

V & D's illustrations are of "juvenile" birds but they are near-identical to what we see here

Vallely's illustration of the side of the neck of juvenile bare-throated tiger-heron is, in my view, markedly and obviously more rufous than the side of the neck in this photo. The overall colour of the side of the neck in this photo resembles much more closely, in my view, Vallely's subadults of bare-throated tiger-heron and fasciated tiger-heron. Hence my suggestion that this bird's plumage might not be fully juvenile, and thus that identifying it by comparison with field guide pics of juveniles may not be valid.
Evidently, we see the colours in Vallely very differently, despite (I think) having the same PDF of that book and (presumably) making the same photo/plate direct comparison on a single device. Thus, this is a matter of differing colour perceptions, which it's therefore not possible to take further

 

[Andy Adcock]

Don't know how many of you have seen them call?