There you'vr got some explanations :
http://www.lpo.fr/images/Presentatio...eauxFrance.pdf

It's updated, since the tables of year 2000 that I saw at the museum :
the town birds have increased again to +- 0 % since then, but the
farmland birds have decreased more to - 39 % (10 % less than the
european average of - 29 %) ! The main tendencies are general in all
western Europe. It's contrasted : the specialised birds decrease at
the difference of the generalists ones. Some family of birds decrease
like "rales" or cold sea birds (pinguin), when other increase
"hérons", preybirds (all except Bonelli eagle the most endangered).
Concerning climate change, the tables of repartition of the 2
"bruants" (respectively in hot and cold zones) show the progression of
the hot zone one to the North. Among the rarest species the population
of 40 of them rise when 20 decline which is encouraging, but the total
number of species in this category increases of about 10. France seems
to have the largest number of species in Europe since it's at the
crossraod of 3 climate areas 277 natives birds on 448. It reaches even
545 for only observation. I should had that in addition to the
pyrenean "bouquetin", the seals (still present on North (Somme bay)
and South coastands don't have anymore reproduction in France (above
all the mediterranean one : phoque moine ?) and that the ganga cata is
also present in iberic peninsula (I didn't know it)...

END