A close view of a brown recluse spider

Come learn about the incredible and fascinating world of bugs.

Field guides, deep-dive articles, videos, a podcast, and a growing glossary of terms.

Word of the Day

Oestridae

A family of robust, hairy flies (Diptera: Brachycera) whose larvae are obligate endoparasites of mammals. Adults are non-feeding and short-lived; females deposit eggs or larvae on or near hosts, and first-instar larvae penetrate skin or enter body openings to develop in subcutaneous tissue (cutaneous myiasis) or internal organs (gastric, nasal, or other cavities). The family includes subfamilies Cuterebrinae (New World skin bots), Hypodermatinae (cattle grubs), Gasterophilinae (horse stomach bots), and Oestrinae (nasal bots of sheep and other mammals).

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Monarch Butterflies and their extraordinary migration