They are most common in Africa, as 80% of the 90,000 breeding pairs mate there.
In Europe, there are an estimated 6,000 to 10,000 breeding pairs.
Now, fewer than four breeding pairs are left on the site.
A population estimate of 40 breeding pairs there was made in 1996.
The number of wild animals is estimated at around 300 to 700 breeding pairs.
The European population is estimated as 100,000 to 430,000 breeding pairs or 300,000 to 1,290,000 individuals.
It is reported that since the 1980s forty breeding pairs have reduced to three.
The current population is estimated at around 25,000 breeding pairs.
The population was estimated at about 230 breeding pairs in 2002.
By 2001 there were perhaps no more than about 100 breeding pairs.