a little History
The islands were discovered in 1535 by Fray Tomas de Berlanga; the bishop of Panama. Berlanga was not an explorer, he wanted to go to Peru which had recently been conquered by Pizzaro., but the he went west because of the currents. He discovered the islands accidentally. The ship he was on, only had a two day supply of water. When they looked on the first island, they looked for fresh water but they didn't find any water. They sailed on to the second island but by the time they reached it they had run out of water; Two men and ten horses died of thirst before water was found. Later, they found fresh water, they learned to follow the tortoises to find fresh water. His men had been reduced due to the men that had to squeeze water from prickly pear cactus pads. Berlanga reported sighting 2 larger islands, he thought they were Santiago and Isabela. They landed on the smaller one of the two. Berlanga did not name the islands were he had reported to the king of Spain. They than started calling it "Insulae de los Galopegos" because of the saddle back giant tortoises, the visitors saw.
"The Galapagos islands have a low biodiversity, because the islands are 600 miles from the nearest land and this huge expanse of inhospitable ocean in between makes it very difficult for new kinds of plants and animals to reach the islands." (https://www.quasarex.com/galapagos/animals-and-wildlife) There is all types of animals on the islands there is: the Galapagos tortoise, the green sea turtle, Marine iguana, Galapagos land iguana, lava lizard, Galapagos gur seal, hoary bat, american flamingo, blue-footed booby, brown noddy, Darwin's finches, Galapagos hawk and way more animals.