Least Bitterns are locally present statewide but are less common in northern Wisconsin. Listen for their sharp alarm calls (see below) during this time. Unlike American Bitterns, their detection increases throughout the summer, peaking when juveniles are active and family groups can be seen or heard communicating with each other in July. If you find one, return to the location a week or more later to try for the “S7”probable code. They seem to be a little more responsive to playback than American Bitterns but are still inconsistent. Preferred habitat is cattail marsh with pools of water but they’ll also occasionally use sedge marshes with open water. The soft calls of this secretive marshbird can be confused with cuckoos and frogs so be careful with this identification, especially if habitat does not seem correct. They will occasionally respond to playback but uncommonly. They’re also quite easy to “S7”, with peak calling in May and tapering at the end of the month.
#Nighttime birds sounds code
Also, be sure to code the bird to the correct block if you are near a block line. In areas with high populations, they can sometimes reach the “M” probable code, but since the call carries very far, sometimes a mile or more, be sure not to double-count birds. They prefer large wetlands or clusters of smaller wetlands for breeding. The familiar “song” of the American Bittern is most frequently heard statewide in sedge marshes but also sometimes in cattail-dominated marshes.
If you cannot make it out in the evening, no worries because they vocalize occasionally at night as well, especially with the aid of playback. If you are planning on targeting the species addressed in part III after sunset, a great method is to begin your outing a little earlier in the evening to target this group. These species vocalize during the daytime and are most likely detected in the early morning or late evening, when they should be targeted. We’ll start with a group of nocturnally active marshbirds. Also addressed are common nocturnal non-avian wildlife you may hear while nocturnally atlasing.
#Nighttime birds sounds series
Our final installment of the series focuses on the rest of the species you may hear at night, which vocalize during daylight hours as well.
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