Boyd’s Bible Dictionary:
(crower). A mistranslation; and perhaps the storm-petrel is meant (Lev. 11:16; Deut. 14:15).
Concise Bible Dictionary:
Only named in scripture as an unclean bird not to be eaten. Some have supposed that a marine bird is alluded to: the RV has “seamew.” There are however cuckoos in the land, and called also by that name, because of their cry (Lev. 11:16; Deut. 14:15).
Common Cuckoo – Cuculus Canorus