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Why do many hosts accept costly avian brood parasitism even when parasitic eggs and nestlings differ dramatically in appearance from their own?

Scientists argue that evolutionary lag or equilibrium can explain this evolutionary enigma.

Permits are seldom granted to individuals, even for research.

A state permit may be required in addition to a federal permit - contact your State game warden/wildlife management agency for more information.

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Egg predators use an array of olfactory and visual cues to locate eggs.

Precocial avian embryos within eggs can produce vocalizations for a period prior to hatching, which may be audible to predators.

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Native birds like Bobolinks and Cedar Waxings were apparently served in restaurants, and stuffed birds adorned hats. Ornithologists targeted rare birds like the Ivory-billed Woodpecker to add to their collections.

Then people, including sportsmen, became concerned about wholesale slaughter of certain species.

Further research involving a greater diversity of predators (e.g., acoustic predators) is required to examine whether vocalizations from the egg incur costs under other predator regimes.

Title 50 - Wildlife and Fisheries Title 50 - Wildlife and Fisheries Chapter I - UNITED STATES FISH AND WILDLIFE SERVICE, DEPARTMENT OF THE INTERIOR (CONTINUED)Subchapter B - TAKING, POSSESSION, TRANSPORTATION, SALE, PURCHASE, BARTER, EXPORTATION, AND IMPORTATION OF WILDLIFE AND PLANTS (CONTINUED)Part 21 - MIGRATORY BIRD PERMITSSubpart D - Control of Depredating and Otherwise Injurious Birds Section 21.50 - Depredation order for resident Canada geese nests and eggs.

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