1. Symbiosis

2. Symbiosis The relationship between two different living things.
Different forms of symbiosis:
Mutualism
Commensalism
Parasitism
Symbiosis refers to the close relationship between two different living things or organism. Many living things including birds or animals form these connections. These relationships can be formed in many ways and may benefit both or just one of the organisms. There are many different reasons for these relationships to be formed but usually they are either for protection or for food. Can you think of any relationships that you know of that occur between different animals or plants?
Now today we are going to talk about three different types of symbiosis. They are mutualism, commensalism and parasitism.

3. Mutualism Both of the living things benefits from the relationship.
The shrimp digs the burrow for themselves and the Goby fish.
The Goby fish guards the entrance to the burrow and keeps an eye out for predators.
Now if you can remember I said earlier that in symbiosis, or the relationship between two living things, one or both of the different organisms can benefit. Mutualism is a form of relationship where both of the living things benefit from their relationship with each other.
One great example of mutualism is the Goby fish and the shrimp. The Goby fish has excellent eye-sight and is great at spotting predators that may be a danger to them. Goby fish however need burrows to live in for protection. The shrimp on the other hand are blind and so cannot watch for predators, but the shrimp are great diggers and excavators. They are tireless workers and love to dig burrows. So the Goby fish and the shrimp are great partners. Why do you think that is? How do you think their relationship might work?
That’s right. The Goby fish, with its excellent eye-sight acts as a guard and waits by the entrance to the burrow checking for any predators. The shrimp meanwhile is busy digging out the burrow and making a home for itself and the Goby fish. This relationship has benefits for both of the organism so this is a great example of mutualism.
Goby Fish: Great eye-sight, needs a burrow for protection
Shrimp: Blind, great at digging burrows

4. Commensalism
One of the living things benefits from the relationship and the other one is unharmed.
The next form of symbiosis, or the relationship between two living things, is commensalism. This type of relationship is where one of the organisms benefits from the relationship while the other is either unaffected or unharmed by the interaction.
Lets have a look at an example of this. This type of bird is a cattle egret. It can be seen flying around or even sitting on the backs of cows. Why do you think these birds might be hanging around the cows?
So the cattle egret follows the herds of cattle and catches all of the insects that get stirred up. This relationship benefits the cattle egret as it has plenty of food to eat without having to do too much work and the cows are not harmed or interfered with by the relationship. This is therefore an example of? Can you remember? Commensalism, that’s right.
Cattle Egret: Eats insects stirred up by cows
Cows: Unaffected by relationship

5. Parasitism
One of the living things benefits from the relationship but the other one is harmed.
The final type of symbiosis, or relationship between two organisms, is parasitism. This is the type of relationship where one of the organisms benefit from the relationship but the other is harmed. Have you ever had a dog with fleas? What happens to the dog?
So fleas jump onto dogs and bite them. They feed off of their blood. The flea does this to eat and to live but it can be very annoying and painful for the dog. If fleas go untreated the dog can become really sick, begin to rip out their hair trying to remove the fleas and can get sours all over their bodies. This relationship defiantly only benefits the fleas so it is parasitism.
Flea: Feeds on the blood of dogs
Dog: Harmed by the presence of fleas

6. Symbiosis Mutualism Commensalism Parasitism Commensalism
One of the living things benefits from the relationship and the other one is unharmed.
Commensalism

7. Both of the living things benefits from the relationship.
Symbiosis
Mutualism
Commensalism
Parasitism
Both of the living things benefits from the relationship.
Mutualism

8. Symbiosis Mutualism Commensalism Parasitism Parasitism
One of the living things benefits from the relationship but the other one is harmed.
Parasitism

9. Symbiosis
Pair & sort