@AndriyM - I suppose that I was being over-pedantic - of course you knew they were baby swans - and now you know the word "cygnet" (in Ukrainian молодий лебідь - what's the transliteration of the characters?).
Originally from the Sanskrit -> Greek -> Latin -> Old French -> English. The modern French word for swan is "cygne" and "cygnet" is essentially "cygnette" - the "ette" suffix in French being a feminine dimunitive!