Ornithologize

I have pretty well finished ornithologizing this spring, and have done worse than ever.

Source: wiktionary

I strongly suspect that this bird has been mistaken by naturalists, who have ornithologized in this section, for the common American raven (Corvus carnivorus), since it seems to me impossible that any one should remain here any length of time without seeing it; […]

Source: wiktionary

In early summer, several years ago, we were ornithologizing in a beautiful clump of natural wood along a steep brae face, so well sheltered from the north and east, and with so sunny and southern an aspect, that it had been known to us for years as the very paradise of all sorts of singing-birds in the nesting season.

Source: wiktionary

I have always followed my own sweet will in Prospect Park; sketched, botanized, ornithologized, entomologized as my whim dictated, and my whim dictates stronger than ever in the present emergency, could I only be on hand to humor it.

Source: wiktionary