Sorting Dataframes

I am a new user, and i am trying to sort out a data frame.

I have for example bins of data.  Within each bin i have multiple counts of
animals and the depths at which these count were taken.  How would I
summarise this to being only the maximum count per bin alongisde the
corresponding height (but not the maximum depth - i want the depth at which
the maximum number of animals occurs).


Thank you


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