(CNN) Behold the delightful kākāpō, a flightless bird that holds the honor of being the fattest kind of parrot in the world. These roly-poly land angels are native to New Zealand, and unfortunately, they are also critically endangered: Up until recently, there were only 147 of them.

You see, according to the New Zealand Department of Conservation, kākāpōs are pretty picky about when they get it on. They only mate every few years when a particular tree, called a rimu tree, puts out an abundance of fruit.

When you have a critically endangered population of precious green potatoes and a country deeply invested in making sure they survive, breeding season becomes an all-hands-on-deck affair. Scientists not only work to encourage kākāpō mating, they also help incubate and monitor eggs and nests.

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