NCF-Envirothon 2026 Mississippi Wildlife Study Resources

Vocabulary terms and definitions related to Mississippi wildlife biology, ecology, and conservation management as outlined in the 2026 Envirothon study resources.

Amniotic Egg

An air-breathing egg characterized by a shell and extraembryonic membranes that enclose the embryo in a private pond during development.

Synapomorphies

Shared derived characteristics including the amniotic egg, claws or nails at the ends of digits, an egg-tooth on the snout, and the complete loss of a water-breathing larva.

Chorion

The extraembryonic membrane that encloses the embryo, yolk, and other membranes while facilitating gas exchange with the exterior.

Amnion

The extraembryonic membrane that directly encloses the embryo.

Allantois

The extraembryonic membrane that receives nitrogenous waste products and facilitating gas exchange; it eventually develops into the urinary bladder.

Yolk sack

The extraembryonic membrane that encloses the yolk mass and facilitates the transfer of water and nutrients to the embryo.

Home range

The area an animal regularly uses to feed, rest, and carry out its daily activities; for whitetail deer, this is defined as where an individual spends $95\%$ of its time.

Territory

An area established and actively defended by an animal or group to keep resources and space for itself.

Core Area

The specific portion of a home range where a deer spends $50\%$ of its time, typically including bedding and preferred feeding areas.

Fall Shuffle

A period in early fall when bobwhite broods mix together in large groups before settling into winter coveys of $12$ to $15$ individuals.

Covey

A social unit of birds, such as Northern Bobwhites, that live together from fall through early spring to conserve energy and provide security.

Keystone species

A species, such as the American beaver, that plays a critical role in maintaining the structure of an ecological community and manipulating its environment.

Maxent

A modeling technique used by researchers that uses data about known animal locations, such as beavers, to predict habitat suitability.

Camouflage (Cryptic Coloration)

A defense mechanism or tactic organisms use to disguise their appearance and blend in with their surroundings to mask location, identity, and movement.

Background matching

A camouflage tactic where a species conceals itself by resembling its surroundings in coloration, form, or movement.

Mimicry

A phenomenon where one organism looks or acts like an object or another organism to gain a survival advantage.

Disruptive coloration

A form of visual disruption where a coloration pattern disguises the identity and location of a species, causing predators to misidentify it.

Warning coloration (Aposematism)

A coloration tactic that highlights an organism's identity to make predators aware of its toxic or dangerous characteristics.

Countershading

A form of camouflage where the top of an animal's body is darker while its underside is lighter, helping it blend into light from above or darkness from below.

Biochromes

Microscopic pigments that absorb certain wavelengths of light and reflect others, allowing organisms like the octopus to change colors.

Olfactory camouflage

A tactic where an animal hides from prey or predators by covering up its smell or masking itself in another species' scent.

Animal density

The number of animals in a unit area, often estimated using the formula: $\text{Density} = \frac{\text{Averaged counts across independent frames}}{\text{Area surveyed by camera}}$

UAVs (Unmanned Aerial Vehicles)

Modern technological tools used to monitor a wide range of wildlife, including birds, terrestrial mammals, and aquatic mammals.

Plant succession

The change in plant communities over time, often moving from annual grasses and forbs to shrubs and eventually mature forests.

Ecotone

The interface or edge where different types of plant communities come together, such as where a forest is next to a field.

Edge feathering

A habitat management practice that involves removing larger trees along a field's edge to let sunlight reach the ground and favor the growth of native grasses and shrubs.

Basal area

The total cross-sectional area of wood in a stand, used by foresters to relate herbaceous ground cover to the density of the forest.

Hub-and-spoke design

A design for forest openings consisting of a central hub with open lanes (spokes) radiating through a stand to maintain grassy cover and serve as fire breaks.

Tularemia

A serious bacterial disease fatal to rabbits and transmissible to humans, often diagnosed by white lesions on the liver and spleen.

Mast

Acorns, nuts, seeds, and fruits from trees and shrubs that serve as vital food sources for squirrels and other wildlife.

Mange (Scabies)

A disease caused by a certain type of mite that irritates the skin and causes hair loss, most common in squirrels during late winter.

Extinct

A status referring to species no longer in existence anywhere on Earth, such as the Passenger Pigeon.

Extirpated

A status describing species that no longer exist in a specific geographic region but still live elsewhere.

Extant

A status describing species that currently exist at at least one location on Earth.

Pittman-Robertson Act

The Federal Aid in Wildlife Restoration Act which directs revenue from an excise tax on firearms and ammunition to state wildlife conservation projects.

Federal Duck Stamp

A required license for waterfowl hunting where $98$ cents of every dollar spent goes directly to purchase habitat or acquire conservation easements.

Grin patch

A notable feature on the bill of a Snow Goose that separates the species from the similar-looking Ross’s Goose.

Cryptic dead leaf pattern

The camouflage pattern on the Chuck-will's-widow that allows it to remain undetected on horizontal tree limbs or the ground during the day.

Aposematism

The use of bright color contrasts to signal toxicity or danger to potential predators.

Siltation

A form of water pollution resulting from feral swine soil disturbance that increases turbidity and contaminates streams, impacting aquatic organisms.