page_title: Carrier's constraint
hierarchical_section_title: Carrier's constraint
caption_attribution_description: Eublepharis macularius Blyth, 1854 English: Leopard gecko (Eublepharis macularius) Español: Gecko leopardo (Eublepharis macularius). Français&#160;: Gecko léopard (Eublepharis macularius) phasé Русский: Пятнистый леопардовый эублефар, леопардовый геккон (Eublepharis macularius) Українська: Леопардовий гекон (Eublepharis macularius) Latina: Eublepharis macularius Polski: Gekon tygrysi (Eublepharis macularius). Português: Lagartixa-leopardo (Eublepharis macularius).
context_page_description: Carrier's constraint is the observation that air-breathing vertebrates which have two lungs and flex their bodies sideways during locomotion find it very difficult to move and breathe at the same time, because the sideways flexing expands one lung and compresses the other, shunting stale air from lung to lung instead of expelling it completely to make room for fresh air.
  It was named by English paleontologist Richard Cowen for David R. Carrier, who wrote his observations on the problem in 1987.
context_section_description: Carrier's constraint is the observation that air-breathing vertebrates which have two lungs and flex their bodies sideways during locomotion find it very difficult to move and breathe at the same time, because the sideways flexing expands one lung and compresses the other, shunting stale air from lung to lung instead of expelling it completely to make room for fresh air.
  It was named by English paleontologist Richard Cowen for David R. Carrier, who wrote his observations on the problem in 1987.
caption: Common leopard gecko
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