Advanced Animal Behavior and Ecology

1. What is "biomagnification" and how does it affect predators?

• A. Increasing body size up the food chain
• B. Concentration of toxins increasing at each trophic level — top predators accumulate the most toxic chemicals ✓
• C. Animals growing larger in enriched environments
• D. Magnifying vision to detect prey

💡 Biomagnification concentrates fat-soluble toxins (DDT, mercury, PCBs) up food chains — phytoplankton absorb trace amounts, small fish concentrate it, large fish accumulate more, top predators (eagles, orcas) reach dangerous levels.

2. What is "island biogeography theory" and who developed it?

• A. A theory about marine island formation
• B. MacArthur and Wilson's theory that island species diversity reflects immigration and extinction rates in equilibrium ✓
• C. A theory about animal distribution on islands
• D. A biogeographic study of specific islands only

💡 MacArthur and Wilson's (1967) island biogeography theory predicts species richness on islands from the balance between immigration (from mainland) and extinction — larger, closer islands have more species.

3. What is "theory of mind" in animal cognition?

• A. Understanding how minds work generally
• B. The ability to attribute mental states to others — understanding that others have beliefs different from one's own ✓
• C. A theory about animal consciousness
• D. A measure of animal intelligence

💡 Theory of mind (ToM) is the ability to attribute mental states to others — great apes pass false belief tasks, suggesting they understand others have different knowledge than themselves.

4. What is "reciprocal altruism" in animal behavior?

• A. Animals always helping relatives
• B. Helping non-relatives now with expectation of future return — vampire bats sharing blood meals with unrelated bats who will reciprocate ✓
• C. A type of social grooming exchange
• D. Animals competing for limited resources

💡 Reciprocal altruism (Trivers, 1971) explains cooperation with non-relatives — vampire bats share blood meals with unrelated colony members who reciprocate later. Requires repeated interactions and cheater detection.

5. What is "optimal foraging theory" in animal behavior?

• A. Animals eating only the best tasting food
• B. Animals maximize energy intake while minimizing time and energy spent foraging ✓
• C. Animals selecting food based on color
• D. A theory about territory selection

💡 Optimal foraging theory predicts animals make foraging decisions to maximize net energy gain — balancing food quality, search time, handling time, and predation risk to optimize caloric efficiency.

6. What is "character displacement" in evolution?

• A. A species changing habitat after competition
• B. When competing species evolve greater differences in sympatry to reduce competition — Darwin's finches beak sizes ✓
• C. When a species loses a characteristic over time
• D. A type of behavioral adaptation to predators

💡 Character displacement occurs when competing species in the same area (sympatry) evolve greater differences to reduce resource overlap — beak size differences between Darwin's finches on islands with competitors vs without.

7. What is the "paradox of the plankton" in ecology?

• A. Why plankton sink instead of float
• B. Hutchinson's paradox: how can many plankton species coexist in seemingly homogeneous water despite the competitive exclusion principle? ✓
• C. Why plankton are so abundant
• D. The unusual diversity of plankton sizes

💡 Hutchinson (1961) noted hundreds of phytoplankton species coexist in seemingly uniform water — paradoxical since competitive exclusion should allow only the fittest. Explained by fluctuating conditions preventing competitive equilibrium.

8. What is "trophic cascade" in ecology?

• A. A waterfall in an ecosystem
• B. Indirect effects rippling through food webs when top predators are added or removed ✓
• C. A type of food chain
• D. A cascade of species going extinct

💡 Trophic cascades show top predators' indirect effects — reintroducing wolves to Yellowstone reduced elk grazing, allowing riverside vegetation recovery, which stabilized riverbanks and changed river courses.

9. What is "allogrooming" and what functions does it serve?

• A. Animals cleaning their own fur
• B. Social grooming between individuals — reinforcing social bonds, removing parasites, and building alliances ✓
• C. A type of territorial marking behavior
• D. Animals grooming their young offspring only

💡 Allogrooming (grooming between individuals) serves multiple functions — parasite removal, wound care, stress reduction, and critically, social bonding and alliance building in primates and other social animals.

10. What is "surplus killing" in predator behavior?

• A. A predator eating more than it needs
• B. Killing far more prey than immediately consumed — wolves, foxes, and leopards occasionally do this ✓
• C. A territorial behavior in large predators
• D. A type of play behavior in young predators

💡 Surplus killing occurs when predators kill many more animals than they immediately eat — wolves killing entire sheep flocks, foxes in henhouses. Thought to occur when prey are unusually vulnerable or abundant.

11. What is "niche partitioning" in ecology?

• A. A species claiming a territory
• B. Different species dividing resources to reduce competition and coexist in the same habitat ✓
• C. Animals partitioning their time between activities
• D. A type of predator territory division

💡 Niche partitioning allows coexistence through resource subdivision — five warbler species in the same spruce trees partition different branches and foraging heights, reducing direct competition (MacArthur's warblers, 1958).

12. What is the "keystone species" concept in ecology?

• A. The most abundant species in an ecosystem
• B. A species with disproportionately large impact on ecosystem structure relative to its abundance ✓
• C. The largest predator in a food web
• D. A species that controls other species through predation only

💡 Keystone species (Robert Paine, 1966) have far greater impact than abundance suggests — sea otters controlling sea urchin populations (maintaining kelp forests) is the classic example.

13. What is "interspecific competition" in ecology?

• A. Competition within the same species
• B. Competition for resources between different species living in the same habitat ✓
• C. A predator-prey relationship
• D. Competition between males for mates

💡 Interspecific competition occurs between different species competing for the same limited resources (food, space, light) — the competitive exclusion principle states two species with identical niches cannot coexist.

14. What is "sentinel behavior" in animal groups?

• A. Animals protecting their territory boundaries
• B. Individuals standing guard to watch for predators while others forage — meerkats and babblers do this ✓
• C. A type of dominance display
• D. Animals marking their territory with scent

💡 Sentinel behavior involves individuals standing guard (at cost to their own foraging) while others feed — meerkats give specific alarm calls for different predator types (aerial vs terrestrial), allowing appropriate escape responses.

15. What is "operant conditioning" and which animals have demonstrated it?

• A. An instinctive behavior pattern
• B. Learning through consequences of actions — Skinner demonstrated it with rats and pigeons ✓
• C. A type of imprinting in birds
• D. Social learning from other animals

💡 Operant conditioning (B.F. Skinner) is learning through rewards and punishments — rats pressing levers for food, pigeons pecking for rewards. Widely used to understand animal intelligence and train animals.

16. What is "natal homing" in animal migration?

• A. Animals born in captivity returning home
• B. Returning to birthplace to breed — Pacific salmon and sea turtles navigate thousands of miles to their exact birth site ✓
• C. A type of homing pigeon behavior
• D. Animals following parents to breeding grounds

💡 Natal homing involves animals returning to their exact birthplace to reproduce — Pacific salmon use magnetic imprinting and olfactory memory to navigate thousands of miles back to their specific natal stream.

17. What is "alarm pheromone" signaling in social insects?

• A. A scent marking territory boundaries
• B. Chemicals released to warn colony members of danger — triggering coordinated defensive responses ✓
• C. A chemical used for mating
• D. A scent left along food trails

💡 Alarm pheromones are chemicals released by threatened colony members — ant alarm pheromones spread rapidly through the colony triggering defensive behaviors, recruiting soldiers, and directing attack toward the threat.

18. What is the "waggle dance" of honeybees?

• A. A mating display dance
• B. A communication dance encoding direction and distance to food sources ✓
• C. A territorial warning behavior
• D. A dance performed only by queen bees

💡 The waggle dance (Karl von Frisch, Nobel Prize 1973) encodes direction (angle from vertical = angle from sun) and distance (duration = distance) to food sources — one of nature's most complex animal communication systems.

19. What is "eusociality" and which mammals are known to exhibit it?

• A. Insects only exhibiting colonial behavior
• B. Highly organized social structure with reproductive division — the naked mole-rat is the only known eusocial mammal ✓
• C. All colony-forming mammals
• D. Primates with complex social hierarchies

💡 The naked mole-rat is the only known eusocial mammal — with a breeding queen, non-reproductive workers, and soldiers. The Damaraland mole-rat is also considered eusocial.

20. What is "play behavior" in young animals and why is it important?

• A. Wasted energy in young animals
• B. Practicing skills needed in adulthood — developing neural connections, social bonds, and hunting or escape techniques ✓
• C. Entertainment behavior with no function
• D. A type of aggressive display

💡 Play behavior in young animals serves critical developmental functions — predator play (stalking, pouncing) develops hunting skills, social play builds relationships and dominance hierarchies, physical play develops motor skills.