Can we confirm robins in every block?

Last summer I wrote a blog post highlighting the 12 species found in the greatest number of blocks during the 1980s breeding atlas.  That list is reproduced here:

1. Song sparrow
2. American robin
3. Gray catbird
4. Black-capped chickadee
5. Mourning dove
6. Northern cardinal

7. Blue jay
8. House finch
9. Common yellowthroat
10. House sparrow
11. Chipping sparrow
12. Tufted titmouse


In the past two days, I’ve confirmed breeding in the first three of these species, and by now it should be possible to confirm any of them. Even common yellowthroats, which have only just returned to the state (and are still well outside the safe dates because migrants are still passing through) are likely to be starting to nest.

A female American robin seen gathering nest material (atlas code CN) in the Eagleville Preserve, Storrs, this morning.

It’s a good time then, to take stock and see how good our coverage is for these common species because that will say a lot about how good our coverage is overall.  I recently posted comparison maps for chickadees and titmice, and these show that detections are widespread, but confirmations less so.  Equivalent maps for American robins are even more encouraging, with a large number of confirmed blocks:

Breeding atlas reports of American robin in Connecticut during the 1980s (left) and during 2018 (plus the first few records from 2019, right).

Nonetheless, there are many blocks where breeding has not been confirmed, and a lot with no records at all.  The latter are concentrated in the east and north of the state, where we know there is less birding activity – and highlight the need for more observations in these areas. But the progress made so far is very encouraging, and by focusing on areas where we know we lack records, we can make this summer’s field work even more efficient.