The table lists characteristics of species of vertebrates that increase or decrease their potential for survival
Select a species of vertebrate that you think is likely to be at risk and another that is likely to be safe, and use the table to determine how well the characteristics of your species fit the categories. (Selecting species that are taxonomically similar--two mammals or two lizards, for example--simplifies the comparison.) At Risk Safe Large body size Small body size Carnivore Herbivore, scavenger, insectivore Narrow habitat tolerance Wide habitat tolerance Valued for a product—meat, fur, oil, etc. Not a source of a commercially valuable product Restricted geographic distribution Wide geographic distribution Intolerant of the presence of humans. Tolerant of the presence of humans Apex predator that bioaccumulates toxins from its prey Lower tropic level predator
Many species fit each of the categories. Here are some examples:
At Risk Safe
Large body size: tiger Small body size: wildcat
Carnivore: hawk Herbivore, scavenger, insectivore: chickadee, vulture, warbler
Narrow habitat tolerance: spotted turtle Wide habitat tolerance: snapping turtle
Valued for a product: toothed and baleen whales, sea otter Not a source of a commercially valuable product: gray squirrel
Restricted geographic distribution: Mona Island iguana Wide geographic distribution: green iguana
Intolerant of the presence of humans: grizzly bear Tolerant of the presence of humans: black bear
Apex predator that bioaccumulates toxins from its prey: peregrine falcon Lower tropic level predator: gyrfalcon
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