![](/nationalgeographic/pioneer_october_2019/unwanted_guests/483866/Group.1024_0_1.png)
Newplantsandanimalscametotheislandswithpeople.Goats,pigs,dogs,andmanyplantswerebroughtheretomakelifeeasierforsettlers.Wecallthesespeciesintroduced species.
![](/nationalgeographic/pioneer_october_2019/unwanted_guests/483872/wrench_video.480_0_1.jpg)
CatsarenotfromtheGalápagos.Acatcanharmnativeandendemic wildlife.
![](/nationalgeographic/pioneer_october_2019/unwanted_guests/483871/wild_boars.480_0_1.jpg)
Wildboars,orwildpigs,nowroamthe islands.
Someintroducedspeciescauseddamageontheislands.Theytookoverhabitats.Or,theyateotheranimals’food.Wecallthesespeciesinvasivespecies.Blackberriesandgoatsaretwo examples.
Blackberrieswerebroughttotheislandsinthe1970s.Theygrewsofast,therewasnoroomfornativeplantsto grow.
![](/nationalgeographic/pioneer_october_2019/unwanted_guests/483870/berries.960_0_1.jpg)
Blackberryplantsgrowandspreadquickly.Theytakeupspacenativeplantsneedto grow.