You need a way to refer back to the details of your specimen as you try to identify it with
the help of field guides or any other resources.
Of course you may not need a camera if you have collected your specimen, but collection should be done
only on your own property or with permission.
Having a permanent record allows you to go back and reevaluate the observation if any anytime
you are are not 100% confident in the original identification, for example if you realize only
later that something very similar exists in the same area.
A digital image makes it easier to get help through internet resources such as
Flickr identification groups, iNaturalist.org, or BugGuide.net.
Contributing to sites like these and many others enables projects, such as Texas Nature
to use your data for research purposes.