Photo: Philadelphia Zoo

Theres great news coming fromPhiladelphia Zoo.

The institution has announced the hatching of four critically endangered Western Santa Cruz Galapagos tortoises.

The hatching marks a first for both the zoo and the hatchlings mother.

Baby Galapagos tortoises that hatched at Philadelphia zoo

Photo: Philadelphia Zoo

The hatchlings, which weigh between 70-80 grams, are reported to be healthy and eating.

They could potentially hatch, as they can take up to eight months to do so.

The sex of Galapagos tortoise hatchlings is determined by the incubation temperature, explains the Zoo.

Galapagos tortoises at Philadelphia zoo

Photo: Philadelphia Zoo

Temperatures below 82.4F produce males and above 85.1F produce females.

Of the 16 eggs laid by Mommy, eight were incubated to become females and eight to become males.

Learn more about the hatchlings in the video below.

Galapagos tortoises eggs that hatched at Philadelphia zoo

Photo: Philadelphia Zoo