The kind of graph you would use for measuring hummidity is a bar graph.
months* I think the best choice would be a line graph since line graphs are known to display data that changes over time. In your question the mass probably changes throughout an owl's life. This info would show clearly in a line graph since the mass changes.
A sphere Graph
the kind of data would be probably something with a percentage or a lot of high numbers that vary in location (:
either a pie chart or a bar graph would work...
While a line graph can help with interpretation by showing the changes in values as a line, there are times when it is not the best king of graph for a particular situation. That is why other kinds of graphs have been developed.
a venn diagram