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