This marked the start of his career as a field naturalist.

He was considered to be one of the best field naturalists of his time.

I'm a lifelong naturalist over 50, and I am a very able field naturalist.

He founded and was the first president of the Field Naturalists' Club in 1906.

He spent his spare time on his passion for natural history and was a well-regarded field naturalist.

They are invariably superb field naturalists, socially active and grand yarners.

Though some of his critics, which included many field naturalists, wondered why no other organism seemed to show the same kind of rapid mutation.

Bully to that, Roosevelt responded, brushing aside the warnings of field naturalists with firsthand experience in the region.

Springer was a field naturalist, mostly self-taught.

Important also, Darwin was a field naturalist, but Huxley was an anatomist, so there was a difference in their experience of nature.