That depends on the topic. Just "orangutans and gorillas" is not sufficient information to write a concluding sentence. I recommend reflecting upon your past paragraphs, since the conclusion should be what you gather from your research.
Therefore you can see
nothing i want this answer
A good conclusion is to say the stuff you said before but not in the same way you need to wrap it up and at the end say Thank You I Hope You Enjoyed my time and effort on my speech. (but remember speech's are hard they take time and alot of work ;)
It's a good way to tie your speech together.
roro best name for an orangutan Dr. Zeus
Orangutan Outreach try REDAPES dot Org.
Eat at one if like fat and heart attacks.
donno
Lucy
In conclusion maybe each of you have a ghost sitting next to you and you don't know it. Boo.
In a speech conclusion, it is important to summarize the key points discussed in the speech and end with a strong, memorable closing statement that reinforces the main message of the speech.
That would depend upon the topic of your speech.