I noticed in a few languages that people can address children using names of animals or plants, to show affection.
For example in English you get:
pumpkin, tiger (sorry, can't think of more examples, but please fill me in if you can)
In French you get:
Ma puce (which means 'my louse'!), ma biche (deer), mon petit chou (my little cabbage)
in Romanian you can get
Ursuleț (teddy bear), gândăcel (little bug).
in Greek
πουλάκι [pul'ɑki] (little bird)
Is this a universal phenomenon that exists in all languages? Which other animal names are used?