min()

df.groupby(column_name).min()

Returns a DataFrame, with rows as groups, and each column as the min of the column values within each group.

Note:

Columns with String values display the minimum alphabetical starting character (ex. "black" is alphabetically before "golden" and "white").

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pets

Index	Species	Color	Weight	Age
0	dog	black	40	5
1	cat	golden	15	8
2	cat	black	20	9
3	dog	white	80	2
4	dog	black	25	0.5
5	hamster	black	1	3
6	hamster	golden	0.25	0.2

pets.groupby('Species').min()

Index	ID	Color	Weight	Age	Is_Cat	Owner_Comment
cat	cat_001	black	1.5	0	True	****All you need is love and a cat.****
dog	dog_001	black	25	0.5	False	There are no bad dogs, only bad owners.
hamster	ham_001	black	0.25	0.2	False	No, thank you!