A black and white African bird (Pluvianus aegyptius) this is certainly about the plover and feeds on bugs that parasitize crocodiles.
The Egyptian plover, Pluvianus aegyptius
an African plover (Pluvianus ægypticus) which alights upon the crocodile and devours its insect parasites, even entering its open mouth (according to reliable writers) in pursuit of files, etc.; -- called also Nile bird. It is the trochilos of ancient writers.
A name of Egyptian black-headed plover, Pluvianus œgyptius, one of many plovers that have been supposed to reply to the trochilus of Herodotus: so called from its connection with all the crocodile. See cut under Pluvianus.
African courser that feeds on pest parasites on crocodiles