Spring migration continues! This April watch for more birds arriving each week from Chipping Sparrows to Pine Warblers there is lots to see. Here’s what to watch for this month: 

• Winter visitors like American Tree Sparrows and redpolls or siskins are usually gone by April. Chipping Sparrows, the tree sparrow look-alike, arrive around mid-April. 
• In early April watch for Hermit Thrush to arrive. Veerys and other thrushes arrive later, usually in May. 
• Ruby-crowned Kinglets begin to arrive the second week of April. Their song can be confused with Common Yellowthroat which doesn’t arrive until the beginning of May and Carolina Wren. 
• Watch for Broad-winged Hawks in the third week of April, especially on a warm, south wind. You can follow their progress north in eBird to know when they are getting close.  
• The earliest warblers arrive mid-month: Pine, Palm, and Yellow-rumped, followed quickly by Louisiana Waterthrush. The first warblers of the main May wave often appear at the very end of the month, including Black-and-white, Northern Parula, and Black-throated Green Warblers. 
• Inclement weather in late April can bring fallouts of migrating Horned and Red-necked Grebes as well as winter sea ducks such as Red-breasted Mergansers and Long-tailed Ducks. Look for them on large lakes such as Newfound, Spofford, or Lake Winnipesaukee. 
• Tree Swallows are the first swallows to return in early April (and often late March), followed by Northern Rough-wingeds. Look for huge flocks over waterbodies if there’s a cold spell or rainy weather. The Merrimack and Connecticut Rivers, waste treatment plants, and even local ponds can provide quite a concentration. 
• Northern House Wrens begin to trickle in during the last few days of April. Wren chatter before that is likely to be Carolina or Winter Wren.