Could you identify that bird ?

[Airy]

I was first intrigued by the song : somewhat remindful of a song thrush, given the repetitions, but slower and less virtuoso. Flute like notes, somewhat modulated up or down, seldom raucous, repeated 3-4 times, then it would switch to another one. The bird was high and I only had my Df + 50mm. In Paris, Champ de Mars, around 9am this morning.

[PedroS]

Can you please make them bigger for download, as the photos are too small to be certain...
And by luck, you didn't record its song... 

Also can you give, approximately, the size of the bird and main color...

[John Geerts]

If I should make a guess I would say The common linnet (Linaria cannabina)   

[MILLIREHM]

difficult to recognize from this picture
common linnet does not fit due to the form of the beak

A turdus i'd say, most likely Turdus philomelos- Song thrush - Singdrossel

[PedroS]

difficult to recognize from this picture
common linnet does not fit due to the form of the beak

A turdus i'd say, most likely Turdus philomelos- Song thrush - Singdrossel

+1

Hard to say, but could a a turdus

It's in Portuguese but you can then identify the song
http://www.xeno-canto.org/species/Turdus-philomelos

let's us know

[Bruno Schroder]

Looks like Turdus philomelos but could also be T. Viscivorus. If the song has repeated motives, then philomelos.

[Airy]

Thanks all for your feedback !

Size : about the size of a song thrush (T. Philomelos)
Photo : cannot be better, apologies. 50/1.2 is not for birding... I could not even guess the color because of backlight until I saw the photo. Enlarged pictures (>200%), easily done after download, suggest a relatively dark back (unlike T. Philomelos)
Song : I heard it again this morning. Same description - repeated motives consisting of a single note, modulated up- or downwards, sometimes with trills. But T. Philomelos is usually much more imaginative, at least in the evening (sunset / dusk) which is the only time I used to hear them. But I confirm the repetitions (3-4 times each). Song is rather loud, at least similar to T. Philomelos (only warblers seem to be louder, from my rare observations in France).
T. Viscivorous : I'll check the song, but the bigger size of Viscivorous does not match my memories.

[rosko]

T. Viscivorous : I'll check the song, but the bigger size of Viscivorous does not match my memories.

Turdus viscivorus is the wildest among the thrushes. Also it sings in high trees (monotonous but pure song) . So, regarding the size of the bird in your picture, I don't think this is a Mistle thrush as it would't leave you near so close.

Also the Mistle thrush shows big black spots on its chest.

Last point : the song of song thrush can slightly vary according to the time of year (most active beginning spring with wider repertoire).

Bigger picture remains best for accurate identification, though.