Common Nighthawk (1.01am). Nighthawks call mostly at twilight on their breeding grounds, but not often during nocturnal migration.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh8_-h3pyvn0WdbJgB0bzk3fabaXbZQ3Cnxl0dJRjpC575oUawb6JLPwmaROJ_n_X0Pc1zFl6HuFwyZZ60AhUFLcd12fK4fOuwjksQJgAztyRMDsyooM_J8k-yrC8s13Cl51j5_lV92uz6i/s320/R09_0004+9.54+051212+%25282%2529+3.07+cnighthawk.wav.png)
Birds occasionally sing while migrating during the night, as with this Veery (4.35am).
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgl_4VbaLpo_YBDgvfde3VNoYb2BE9y9r0s65XSiVn0yo-9lbGTmASnCyBM30_NhGlIkT_bt2SbGaIiWuj1H0dxI_7FoSemjz2suP_U5pk3ldo9PyblK0DR5qdunFElWSQ15pIbTlBWwOyH/s320/R09_0005+%25282%25293.13.10+veery+singing+in+flight.wav.png)
Dickcissels are uncommon migrants in the Delaware Valley. The flight call is an unmistakable low buzz (10.30pm).
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi-8EXd-ziipXGe59mKKsg1zRwZbvHAUeBvF_oGLZ8nlq7on9X3jGLCeuXZSVnMIFQv9qccHiGjCDUHvZT9gomm2Cmiz4VP7V21esQQLIpczK3zq4DJoCyvWDojxqDyJLHKD89Mcg-ahLj5/s320/Dickcissel+Elkins+Park+PA++10.30+pm+051112.WAV.png)
Shorebirds can be quite vocal while flying at night:
Least Sandpiper (12.01am).
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhZAeTOyaSGANH7GDl23-CJXX9R3CU9_Jy4SGltyDf7jBDEBWeLj0282_fNN7FrgzE6fCk_xvRyTK7u_dzQvapAwqs3g5-lsv_caKv5XKCzxt1VJYhtRu9pVMdHNxg6SxKXAWk0ac_5yf1N/s320/R09_0004+%25282%2529+2.07+shorebird.WAV.png)
Semipalmated Plover (11.52 pm).
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgsu9eyrX8ui7J3FktU3MsrP5MKZkNrrr0BVhkhrnNs30E1-0QxYBwBOkiDL6as92xACMA58UPq42THWxk_FgGqU_OdQuaQahk0Ihb0NGhIcURNhhK3o7F4g3lZOPdW8Ofpa4uxjiSw7bUt/s320/R09_0004+%25282%25291.58.54+plover.WAV.png)
Solitary Sandpiper (3.41am).
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg_n7xpIz7zR-0yioJLOOpMl-2eGtQZH2GQuJbJ6pjPSPxa-PW0m1mi6LdzxYHunveCpCtIwlTS5sAvcsze0JlIOH2NZiYoT-kQd071I96I92DqHSJhJuZ9I77AlxeNidr0rnDCaTsjyKKq/s320/R09_0005+%25282%25292.19.20+solitary.wav.png)
Both cuckoos vocalize frequently during migration. The Black-billed Cuckoo makes a swallowing sound (2.45am).
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjidAWSrHsM99-1gpwXq3FjN3984ucQ_pohDSh0t52XwIq3qbklloUpCvZZj-KnQGeMorpVPGckJs-yG_4F-5-iLKjpQBNEGzpclwKFnAywzEnYHX_X4_LQAkBZfSLbMKdU9tgA2_BtMkTv/s320/R09_0005+%25282%2529+bbcuckoo+14.45.mp3.png)
Yellow-billed Cuckoo "knocker" call (12.45am).
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhS-nUXE5mfGSBjLf-Q5jnXCaIXah8uz2koiIuzMR3dUy9cOhXZivWGQF_Og3YMK7kCNvqLN7729MHyjKOzL4CSmILuuDwBEJHcxzx9nEg5K_vL11Ud6uZGC7h0KD_aqSa7glZ6i614csjm/s320/R09_0004+9.54+051212+%25283%2529++2.51.12ybcuckoo.mp3.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiHgq6ZJSftWEJMU9zO8y8wZHezLeOPQRkwqfrypMOilHm6pgT1IO3FDSP_Qaep_zQ9-muiVDCMKg106rluuvFE7BntsipWpWTJ8poSvsCuBYe0Y77n3I-XZ-KBARS4GvhKasnwvD0mZo9G/s320/R09_0004+9.54+051212+%25282%2529++2.51.12ybcuckoo.mp3.png)
Unknown call (2.01 am). This was an isolated call, perhaps an anomalous Swainson's Thrush?
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhZQ91pTSzegeV9aPEguhEPbfVTxtxauiTc-ytng7fIR-ahzZNhZc0vxYjczgktWlC5ikfu41584OQzul_y-TDURAnuG5gVHf_foxVAa-qbNDdPFp9LaEw5JPsDVIBuSe1s3xCzK7quOZJU/s320/R09_0005+%25282%2529+38.40.wav.png)
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