Ecological Interactions

 Hermit crabs live in shells made and then abandoned by snails. This relationship neither helps nor harms the snails.

• parasitism
• commensalism
• mutualism

A cuckoo may lay its eggs in a warbler's nest.  The cuckoo's young will displace (or move) the warbler's young and will be raised by the warbler.  

• Parasitism
• Commensalism
• Predation
• Competition

Ostriches and Gazelles feed next to each other.  They both watch for predators and alert each other to danger.  Since the visual abilities of the two species are different, they can each identify threats the other animal would not as readily see.  

• Parasitism
• Commensalism
•  Mutualism 
• Competition.  

 The stork uses it saw-like bill to cut up the dead animals it eats. As a result, the dead animal carcass is accessible to some bees for food and egg laying. The relationship neither harms nor benefits the stork.

• parasitism
• commensalism
• mutualism

Yucca flowers are pollinated by yucca moths. The moths lay their eggs in the flowers where the larvae hatch and eat some of the developing seeds.  

• Mutualism
• Commensalism
• Parasitism
• Competition

Rabbits and sheep both graze on shrubs, grasses, and other plants.  The increase in the population of rabbits in a region may result in a shortage of plants for sheep to graze upon.  After the increase of rabbits the relationship between sheep and rabbits will be __________.

• Competition
• Predation
• Mutualism
• Parasitism

Mistletoe extracts water and nutrients from the spruce tree to the trees detriment.  

• Parasitism
• Mutualism
• Commensalism
• Predation

Sharks consume (eat) smaller fish they catch in the ocean. Frogs catch and eat flying insects in ponds. What type of relationship is this?

• mutulism

• predation

• parasitism

• interspecific

Sloth’s and monkeys share the same tropical habitat.  Deforestation is occurring limiting the space for these two species.  What will now occur between the two species?

• Mutualism
• Parasitism
• Cooperation
• Competition

An interaction among species where one organism hunts, kills, and eats another organism.

• Predation
• Cooperation
• Mutualism
• Parasitism