Endothermy
Guides
Anax junius
Common Green Darner, Green Darner
Anax junius, the common green darner, is among the most abundant and widespread dragonflies in North America, ranging from Canada to Panama and with populations in the Caribbean, Tahiti, and Asia. This large aeshnid is renowned for its extensive seasonal migrations, with individuals traveling up to 2,800 km between northern breeding grounds and southern overwintering areas. The species exhibits complex population dynamics, with both migratory and resident cohorts coexisting at many locations. Adults are powerful aerial predators, while aquatic nymphs are similarly voracious, making this species a significant component of both terrestrial and aquatic food webs.
Gasterophilus intestinalis
Horse Bot Fly, Horse Botfly
A parasitic bot fly found worldwide that infests the gastrointestinal tract of equids. Adults are bumblebee mimics active in summer, lacking functional mouthparts and living only a few weeks. Females cement eggs to horse hairs; larvae develop in the mouth and stomach for 8–10 months before exiting in feces to pupate. Infestations rarely cause clinical disease but adults are a nuisance to horses.
Polistes dominula
European Paper Wasp
Polistes dominula is a highly successful invasive social wasp native to Eurasia that has established populations across North America, South America, New Zealand, South Africa, and other regions. First detected in North America near Boston in 1978, it has become one of the most abundant wasps on the continent. The species builds small, exposed paper nests in protected locations and preys primarily on live insects, particularly caterpillars. Unlike yellowjackets, it does not scavenge for meat or sugar. Its rapid spread has been attributed to ecological flexibility, superior competitive ability, and tolerance of human-altered environments.
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sphinx moths, hawk moths, hornworms, hummingbird moths
The Sphingidae are a family of moths comprising approximately 1,450 species, best represented in tropical regions but occurring worldwide. Members are moderate to large in size with exceptional flight capabilities, including sustained hovering and rapid, agile maneuvering that rivals hummingbirds. Their streamlined bodies and narrow wings represent convergent evolution with nectar-feeding birds and bats. The family includes economically significant species: some adults are important pollinators with extremely long proboscises, while larval hornworms are major agricultural pests on solanaceous crops.