For myself, and I am sure I speak for many others where this species resides, getting a view or even glimpse is infrequent and can be challenging. Over the past several years my personal encounters have been far and few between. Once was at dusk (a momentary flyby) and other times were simply calls. Fortunately this past April during an apparent mating season at Laguna Niguel Regional Park you could not only hear but also see the Least Bitterns in mid-day hours. I was first attracted by their calls on April 10 at dusk, then opted to revisit the park again during day time hours the following day, April 11, 2016.. Additionally I was able to obtain reasonably good sound recordings on a cell phone and at close range. Both photos and also the sound recordings can be found below.
For additional photos go here: http://ocbirds.com/gallery/least-bittern/