Why does friends/ids show a different number of friends than the twitter UI?


I am using the API to request all friends for a particular user. No cursoring is involved because the total number is less than the default page size.

The problem is that when I look at the user’s twitter page I see a number that is slightly higher than what the API returns. The difference is 5 to 10. There is a comment on the doc page about filtering out suspended users after requesting all friends.

What is causing the disparity?
How can I find those additional users?