Most of the photos were taken with a Nikon 800 mm lens, but the distances were often too big to make a really sharp photo. Also, the circumstances were often not suitable for a good to perfect picture. I made a mistake by going with a group of birders instead of a group of bird photographers but the group helpt me to be able to make some nice shots.
I made a book of the birds and here you can look into it.
https://www.albelli.nl/onlinefotoboek-bekijken/c418d2e5-c633-46b6-b066-6a9b8629cb93