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River Otter
  • 1. What is the scientific name for the North American river otter?
A) Aqua otterus
B) Otterus riverinus
C) Riverus americensis
D) Lontra canadensis
  • 2. How many species of river otters are there?
A) 5
B) 27
C) 13
D) 8
  • 3. What is the average lifespan of a river otter in the wild?
A) Less than 1 year
B) 2-4 years
C) 20-25 years
D) 10-15 years
  • 4. What is a group of river otters called?
A) A school
B) A romp
C) A herd
D) A flock
  • 5. How do river otters hunt for food?
A) They dive underwater to catch prey
B) They climb trees to catch birds
C) They beg for food from humans
D) They use traps
  • 6. What family do river otters belong to?
A) Ursidae
B) Mustelidae
C) Felidae
D) Canidae
  • 7. Do river otters have a strong sense of smell?
A) Only on weekends
B) Yes
C) It depends on the weather
D) No
  • 8. How do river otters groom themselves?
A) By taking dust baths
B) By rolling in mud
C) By licking their fur
D) By using hairbrushes
  • 9. Do river otters hibernate?
A) They hibernate underwater
B) No
C) Yes, for several months
D) Only if it's a leap year
  • 10. What is the conservation status of the North American river otter?
A) Least Concern
B) Endangered
C) Vulnerable
D) Critically Endangered
  • 11. What is the role of river otters in their ecosystem?
A) They are predators of birds
B) They are scavengers
C) They are known for their singing abilities
D) They help maintain the balance of fish populations
  • 12. What adaptation allows river otters to swim gracefully underwater?
A) Striped fur
B) Webbed feet
C) Sharp claws
D) Blubber layer
  • 13. Which of these senses is highly developed in river otters?
A) Hearing
B) Smell
C) Taste
D) Sight
  • 14. During which time of day are river otters most active?
A) Noon
B) Afternoon
C) Midnight
D) Dawn and dusk
  • 15. In which epoch did the river otter and the giant otter of South America diverge?
A) Pliocene epoch
B) Eocene epoch
C) Miocene epoch
D) Oligocene epoch
  • 16. What type of ecosystems do North American river otters typically establish their dens in?
A) Mountainous areas
B) Desert and arid regions
C) River, lake, swamp, coastal shoreline, tidal flat, or estuary
D) Urban environments
  • 17. What is a significant factor contributing to the decline of North American river otter populations?
A) Climate change
B) Overhunting by humans
C) Environmental pollution
D) Natural predators
  • 18. When did fossils of a giant otter dating back 3.5 million years ago appear in the US Midwest?
A) During the Eocene epoch
B) During the Miocene epoch
C) During the Oligocene epoch
D) During the Pliocene epoch
  • 19. How did New World river otters originate?
A) From Old World river otters via the Bering Land Bridge
B) Via migration through Europe
C) Through evolution in North America
D) Directly from South America
  • 20. Who first described the North American river otter?
A) Carl Linnaeus
B) Charles Darwin
C) George Cuvier
D) Johann Christian Daniel von Schreber
  • 21. Under which appendix is Lontra canadensis listed by CITES?
A) Not listed
B) Appendix II
C) Appendix I
D) Appendix III
  • 22. Which subspecies of North American river otter is found on the Queen Charlotte Islands, British Columbia?
A) L. c. pacifica (J. A. Allen, 1898)
B) L. c. canadensis (Schreber, 1777)
C) L. c. periclyzomae (Elliot, 1905)
D) L. c. sonora (Rhoads, 1898)
  • 23. What percentage of summer spraints in Georgia contained remnants of crayfish?
A) 50%
B) 75%
C) 85%
D) 98%
  • 24. In which part of the United States are North American river otters still rare or absent?
A) Midwestern United States
B) Northwestern United States
C) Northeastern United States
D) Southwestern United States
  • 25. What type of prey do North American river otters avoid consuming?
A) Carrion
B) Reptiles
C) Amphibians
D) Fish
  • 26. In which state did crayfish account for two-thirds of the North American river otter's summer diet?
A) Arkansas
B) Georgia
C) California
D) Texas
  • 27. In which season do North American river otters consume more aquatic insects?
A) Winter
B) Summer
C) Fall
D) Spring
  • 28. Which subspecies of North American river otter is found in central California?
A) L. c. canadensis (Schreber, 1777)
B) L. c. mira (Goldman, 1935)
C) L. c. pacifica (J. A. Allen, 1898)
D) L. c. periclyzomae (Elliot, 1905)
  • 29. What does Appendix II of CITES indicate about a species?
A) Species are critically endangered and need immediate protection.
B) Species have stable populations without any risk.
C) Species are extinct in the wild.
D) Species not necessarily threatened with extinction but may become so unless trade is controlled.
  • 30. What is the average weight of an adult male North American river otter?
A) 20 kg (44 lb)
B) 11.3 kilograms (25 lb)
C) 15 kg (33 lb)
D) 8.3 kg (18 lb)
  • 31. Which order of aquatic invertebrates does NOT form a significant part of the North American river otter's diet?
A) Coleoptera (adult beetles)
B) Plecoptera (stonefly nymphs)
C) Odonata (dragonfly nymphs)
D) Hemiptera (true bugs)
  • 32. Which prey do North American river otters sometimes consume more than fish, depending on regional availability?
A) Aquatic plants
B) Crustaceans (crayfish)
C) Birds
D) Small mammals
  • 33. Which family of fish do North American river otters prefer in Colorado's Upper Colorado River Basin?
A) Ictaluridae (bullheads and catfish)
B) Catostomidae (suckers)
C) Salmonidae (trout)
D) Cyprinidae (carp and daces)
  • 34. What percentage of North American river otter scat samples in an Alberta study contained fish remnants?
A) 50%
B) 75%
C) 91.9%
D) 60%
  • 35. Which terrestrial predator of the North American river otter is known to coexist with it?
A) Killer whale
B) American crocodile
C) Red fox
D) American alligator
  • 36. Which large animal's remains have been found in North American river otter scat, despite not being a regular part of their diet?
A) Ducks
B) Mollusks
C) North American beaver
D) Common snapping turtle
  • 37. Which specific species of amphibian is included in the North American river otter's diet?
A) Green frogs
B) American bullfrogs
C) Boreal chorus frogs (Pseudacris maculata)
D) Northwestern salamanders
  • 38. What is the average weight of an adult female North American river otter?
A) 15 kg (33 lb)
B) 11.3 kilograms (25 lb)
C) 8.3 kg (18 lb)
D) 20 kg (44 lb)
  • 39. What distinguishes North American river otters from Eurasian otters in terms of reproduction?
A) Shorter gestation period
B) Lack of parental care
C) Delayed implantation
D) Higher litter size
  • 40. Which reptile is part of the North American river otter's diet?
A) Northwestern salamanders
B) Rough-skinned newt
C) California giant salamander
D) Garter snakes (Thamnophis)
  • 41. What has been particularly valuable in restoring river otter populations?
A) Culling of predators
B) Urban development
C) Introduction of invasive species
D) Reintroduction projects
  • 42. How much of the North American river otter's total length is made up by its tail?
A) About one-third
B) One-fourth
C) Half
D) Two-thirds
  • 43. How many specialized teeth do North American river otters have?
A) 30
B) 36
C) 42
D) 28
  • 44. What type of birds are most vulnerable to North American river otters during summer?
A) Colonial nesting birds
B) Waterfowl broods
C) Rails
D) Birds in flight
  • 45. What year did wildlife management agencies begin reintroduction projects for North American river otters?
A) 1976
B) 2000
C) 1994
D) 1980
  • 46. Which bird species is not mentioned as part of the North American river otter's diet?
A) Mallard
B) Peregrine falcon
C) Northern pintail
D) Canvasback
  • 47. Which subspecies of North American river otter is found in Mexico?
A) L. c. pacifica (J. A. Allen, 1898)
B) L. c. kodiacensis (Goldman, 1935)
C) L. c. sonora (Rhoads, 1898)
D) L. c. canadensis (Schreber, 1777)
  • 48. In which region did a study find crayfish forming nearly 100% of the river otter's diet at certain times?
A) Alberta, Canada
B) Central California marshland
C) Western Oregon
D) Northwest Territories
  • 49. Which subspecies of North American river otter is found on Kodiak Island, Alaska?
A) L. c. lataxina (Cuvier, 1823)
B) L. c. canadensis (Schreber, 1777)
C) L. c. sonora (Rhoads, 1898)
D) L. c. kodiacensis (Goldman, 1935)
  • 50. What is the maximum weight that large male North American river otters can exceed?
A) 15 kg (33 lb)
B) 20 kg (44 lb)
C) 11.3 kilograms (25 lb)
D) 8.3 kg (18 lb)
  • 51. In which Canadian province were North American river otters recently re-establishing themselves?
A) Quebec.
B) Prince Edward Island.
C) British Columbia.
D) Ontario.
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