internally because they need time to hatch them
Sloths fertilize the opposite sex internally. Mating occurs when a male sloth climbs to the female's territory, and after courtship behaviors, the male will mate with the female. The fertilization process takes place inside the female's body, leading to the development of the young sloth.
Fish develop externally, meaning that fertilization and embryonic development occur outside of the parent fish's body. The eggs are often released into the water where fertilization takes place, and the embryos develop independently until they hatch.
Birds develop internally, which means inside the creatures body.
GiraffesElephantsRhinosPenguinsOrangutansWhalesSnakesTurtlesChickenMosquito
Yes, penguins do have ankles. However, their ankle joints are not as visible externally because of the thick layer of feathers covering their legs.
internally
externally
internal
That depends on the species you are asking about, mammals fertilize internally and fish externally.
Guppies are fertilised internally they are livebearers.
Amphibians fertilize their eggs externally.
Koalas do not fertilize their young. They fertilize each other (internally) to produce young.
A deer is a mammal, so reproduction is done internally.
true
Internal fertilization
No. Fishes fertilize externally.
Fish and amphibians are two groups of animals that typically fertilize externally. They release their eggs and sperm into the water to fertilize externally rather than internally.