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Testing Hamilton's selfish herd effect, Alta De Vos and Justin O'Rainn (2010) studied brown fur seal predation from great white sharks. Using decoy seals, the researchers varied the distance between the decoys to produce different domains of danger. The seals with a greater domain of danger had an increased risk of shark attack. [44]
Male northern elephant seals will fight to defend their harems from rival males, note the pink scarring on the neck of the dominant male. Organisms can also express heritable adaptive behaviors. These behaviors are encoded in their genes and inherited from their parents. This gives the organisms the ability to respond to situations with their ...
Brown fur seal Gaston in Prague Zoo Fur seals used for tourist attraction in Namibia This species is an inquisitive and friendly animal when in the water, and often accompanies scuba divers. They swim around divers for periods of several minutes at a time, even at a depth of 60 m.
A freshwater aquatic food web. The blue arrows show a complete food chain (algae → daphnia → gizzard shad → largemouth bass → great blue heron). A food web is the natural interconnection of food chains and a graphical representation of what-eats-what in an ecological community.
Humans sometimes live by hunting other animals for food and materials such as fur, sinew, and bone, as in this walrus hunt in the Arctic, but humans' status as apex predators is debated. Ecologists have debated whether humans are apex predators. For instance, Sylvain Bonhommeau and colleagues argued in 2013 that across the global food web, a ...
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Adult Guadalupe fur seals are dark brown or dusty gray with yellowish silver manes, called guard hairs, on the back of the neck. [3] Guadalupe fur seals are sexually dimorphic in size, as males are much larger and heavier than females; males can grow to about seven feet in length and weigh upwards of 400 pounds, while females are typically only five feet long and weigh about 110 pounds. [4]
Last year though, the government approved a new 10-year crocodile management plan to help control the numbers, which increased the quota of crocs that can be killed annually from 300 to 1,200.