comments:
2020-06-02.
Аскар Исабеков: White-winged Terns
2020-06-03.
Pjotr Trommel: So this ones are also black terns I presume?
2020-06-03.
Аскар Исабеков: Yes, Black terns, I forgot main feature, the colour of underwing coverts, black in White-wunged tern and grey in Black one.