Animal Behavior and Migration: Foundations, Biology, Expressions, and Navigation

Comprehensive vocabulary flashcards covering foundations of ethology, neurobiology, learning principles, behavioral ecology, domestication, and migratory mechanisms.

Collagen

A structural protein produced by animals that distinguishes them from fungi (which have chitin), plants (which are photosynthetic), and protists (which are mostly unicellular).

Behavior

The manner in which an animal interacts with other organisms, its internal physiological signals, and its physical environment.

Phylogenetic Tree

A hypothesis about evolutionary ancestry built from DNA and morphological features, in which internal nodes designate last common ancestors.

Fitness

An organism's reproductive success across its lifespan, as opposed to its physical strength or prowess.

Kin Selection

An evolutionary strategy that favors reproductive success and costly helping behavior directed toward genetic relatives.

Hamilton's Rule

The mathematical condition $r \times B > C$ governing kin selection, where helping behavior is favored when the coefficient of relatedness ($r$) multiplied by the recipient's benefit ($B$) exceeds the helper's cost ($C$).

Inclusive Fitness

An individual's total genetic contribution, calculated as direct fitness (own offspring) plus indirect fitness (reproductive success of relatives, weighted by shared alleles).

Ethology

The scientific study of animal behavior in natural conditions, historically founded by Konrad Lorenz, Niko Tinbergen, and Karl von Frisch.

Tinbergen's Four Questions

A framework for analyzing animal behavior comprising proximate causes (mechanism/causation and ontogeny/development) and ultimate causes (adaptive function and phylogeny/history).

Ethogram

A standardized, predefined catalog of mutually exclusive, objective behaviors observed within a species.

Cohen's Kappa

A statistical coefficient measuring inter-observer reliability that corrects raw percentage agreement for the agreement expected purely by chance.

Reflex Arc

A five-part neural circuit comprising a sensory receptor, sensory neuron, central integration center (such as the spinal cord), motor neuron, and effector organ.

Sympathetic Division

The branch of the autonomic nervous system originating in the thoracic and lumbar spinal cord that utilizes norepinephrine at postganglionic synapses to initiate fight-or-flight responses.

Parasympathetic Division

The branch of the autonomic nervous system originating in the brainstem and sacral spinal cord that releases acetylcholine from postganglionic fibers to mediate rest-and-digest processes.

HPA Axis

A neuroendocrine feedback system comprising the hypothalamus, anterior pituitary gland, and adrenal cortex that coordinates the physiological endocrine response to stress.

Corticotropin-Releasing Hormone (CRH)

A peptide hormone secreted by the paraventricular nucleus of the hypothalamus that stimulates the anterior pituitary to synthesize and release ACTH.

Adrenocorticotropic Hormone (ACTH)

An anterior pituitary hormone released into systemic circulation that stimulates glucocorticoid synthesis and secretion by the adrenal cortex.

Cortisol

A steroid hormone secreted by the adrenal cortex that crosses cell membranes to bind glucocorticoid receptors, mobilizing energy and executing negative feedback on CRH and ACTH.

Suprachiasmatic Nucleus (SCN)

A bilateral hypothalamic structure situated immediately above the optic chiasm that serves as the master biological circadian clock in vertebrates.

Zeitgeber

An external environmental synchronizer, most notably ambient light, that entrains an organism's endogenous biological clock to a 24-hour cycle.

Fixed Action Pattern (FAP)

An innate, stereotyped motor sequence triggered by an external sign stimulus that proceeds inexorably to completion once initiated.

Supernormal Stimulus

An exaggerated, artificial stimulus that elicits a more intense behavioral response than the naturally occurring releaser.

Habituation

A form of nonassociative learning characterized by a progressive decrease in synaptic transmission and behavioral responsiveness following repetitive, non-threatening stimuli.

Sensitization

A nonassociative learning process in which a strong or noxious stimulus enhances subsequent reflex responses via interneuron serotonin release and prolonged action potentials.

Classical Conditioning

A form of associative learning in which a biologically salient unconditioned stimulus is paired with a neutral conditioned stimulus until the neutral cue elicits a conditioned reflex.

Operant Conditioning

A form of associative learning in which voluntary behaviors are modified, maintained, or suppressed by their subsequent consequences.

Positive Reinforcement

An operant procedure in which the presentation of a favorable stimulus following a behavior increases the future frequency of that behavior.

Negative Reinforcement

An operant procedure in which the removal or termination of an aversive stimulus following a behavior increases the future frequency of that behavior.

Positive Punishment

An operant conditioning procedure in which an unpleasant or aversive stimulus is added following a response to reduce the frequency of that behavior.

Negative Punishment

An operant conditioning procedure in which a rewarding or pleasant stimulus is withdrawn following a response to decrease the frequency of that behavior.

Shaping

An operant training methodology involving the differential reinforcement of successive approximations toward a complex terminal target behavior.

Extinction (in Learning)

The gradual reduction and eventual cessation of a conditioned behavioral response when reinforcement contingencies are terminated.

Epigenetic Modification

Heritable or long-lasting alterations in gene expression, such as histone modification or DNA promoter methylation, that occur without changing the underlying DNA nucleotide sequence.

Optimal Foraging Theory

An ecological model positing that natural selection optimizes foraging behavior to maximize net caloric intake per unit of foraging time spent searching, pursuing, and handling food.

Marginal Value Theorem

An optimality model predicting that a foraging animal should depart a resource patch when its instantaneous rate of intake drops to the average intake rate across the surrounding habitat.

Giving-Up Time

The duration of time an animal remains in a foraging patch between its final prey capture and its departure.

Evolutionarily Stable Strategy (ESS)

A behavioral strategy that, when adopted by the majority of a population, cannot be outcompeted or invaded by any rare mutant alternative strategy.

Signal

An evolved morphological or behavioral act that conveys information and provides a reciprocal adaptive fitness benefit to both sender and receiver.

Cue

An incidental, non-evolved physical or behavioral attribute that provides information to an observer or receiver without benefiting the producer.

Grimace Scale

A standardized ethological scoring metric used to quantify physical pain in animals by evaluating specific facial action units.

Fisherian Runaway Selection

A sexual selection model wherein arbitrary female mate preference and a male secondary ornament become genetically correlated, fueling an escalating positive feedback loop.

Handicap Principle

The sexual selection hypothesis proposing that conspicuous male secondary sexual traits are honest indicators of quality because they impose substantial fitness costs that only high-quality males can survive carrying.

Hamilton-Zuk Hypothesis

A sexual selection theory positing that elaborate secondary sexual ornaments serve as honest signals of an individual's genetic resistance to parasites and pathogens.

Eusociality

The highest level of social organization, defined by cooperative brood care, overlapping generations in a colony, and a reproductive division of labor with sterile or non-reproductive castes.

Cognitive Bias Test

An experimental paradigm assessing animal affective states (optimism versus pessimism) by measuring behavioral responses toward ambiguous, intermediate sensory cues.

Behavioral Syndrome

A suite of correlated behavioral tendencies (such as boldness, exploration, and aggressiveness) that are consistently co-expressed across distinct environmental contexts.

Repeatability

A statistical metric quantifying the proportion of total behavioral variation attributable to consistent differences among individual animals across multiple assessments.

Anna Karenina Principle (in Domestication)

Jared Diamond's rule stating that a candidate animal species must satisfy six criteria (diet, growth rate, captive breeding, disposition, low panic, and social hierarchy) to be domesticated, where failure in any single trait precludes domestication.

Domestication Syndrome

A shared constellation of morphological and physiological traits accompanying animal domestication, including floppy ears, curled tails, reduced brain volume, juvenile facial profiles, and decreased adrenal activity.

Neural Crest Hypothesis

A developmental model positing that artificial selection for tameness produces the domestication syndrome by reducing embryonic neural crest cell migration, impacting cartilage, pigmentation, and adrenal tissue.

HIREC

An acronym for Human-Induced Rapid Environmental Change, designating anthropogenic environmental challenges such as habitat fragmentation, light pollution, and climate shifts.

Migration

A synchronized, cyclical movement of organisms tied to seasonal or life cycles that encompasses a dedicated return journey to the geographic origin.

Zugunruhe

An innate, heightened state of migratory restlessness displayed by caged migratory organisms during their normal migration seasons.

Dispersal

A permanent, unidirectional departure of an individual animal away from its birthplace or natal territory with no return movement.

Obligate Migrant

An animal species or population governed by an innate physiological imperative to migrate annually to complete its life cycle and reproduce.

Facultative Migrant

An individual or population that migrates flexibly depending on prevailing local environmental variables, food supplies, and weather conditions rather than an absolute seasonal clock.

Partial Migration

A demographic migratory structure wherein a subset of a population migrates while the remaining individuals stay as sedentary, year-round residents.

Quorum Response

A collective decision-making threshold wherein an animal's probability of initiating a behavioral shift escalates nonlinearly as an increasing number of group members perform the behavior.

Radical-Pair Mechanism

A proposed avian magnetoreception process in which blue light excites retinal cryptochrome proteins, generating magnetically sensitive chemical radical pair intermediates.

Diel Vertical Migration

A daily, synchronized aquatic movement in which zooplankton and marine organisms ascend to surface layers at night to feed and descend into the deep ocean by day to evade visual predators.