c'est

1. it is (used to define the preceding word)
2. it is (used to introduce a focus)
3. this is

un

• Article

  an, a

• Num
• Pron
• Noun

petit

• Adj

  1. small
  2. little
  3. petty

• Noun

mammifère

mammal

qui

• Pron

  1. who, whom
  2. who, whom (after a preposition), which, that

• Conj

fait

• Noun

  fact

• Verb
• Verb
• Adj

partie

• Noun

  1. part (portion, amount)
  2. party
  3. game, play (sense "the conduct, or course of a game")
  4. subset

• Verb

des

• Article

  1. plural of un (“some; the plural indefinite article”)
  2. plural of une (“some; the plural indefinite article”)
  3. plural of du (“some; the plural partitive article”)
  4. plural of de la (“some; the plural partitive article”)
  5. plural of de l’ (“some; the plural partitive article”)

• Contraction