Translation:A baby rabbit is cute. But a baby snake is not cute.
yall im just gonna say it.
DO NOT use 새끼 AT ALL in real life even referring to a baby animal.
the word has evolved to mean something rude like the female dog thing in english. so unless you wanna get punched don't say it.
usually -아지 is added before or after the animal (depends which ones). even though duolingo would probably not accept the -아지 addition except for puppy (강아지) its just something to know for real life convos