because a crayfish is a fish and a frog is not.
Frog eggs are externally fertilized where as mammal and reptile eggs are fertilized
internally.
Mammals differ from birds as birds lay eggs, and mammals give live birth.
No, a reptile cannot be a mammal. Mammals are warmblooded and reptiles are coldblooded. Mammals give birth to live young and reptiles lay eggs. Mammals have hair and reptiles have scales on their skin.
Yes. All mammals have internal fertilization.
A lizard is a reptile for several reasons. It is cold-blooded, unlike mammals which are warm-blooded. Also, it lays eggs, whereas mammals do not, and it also does not have hair, which mammals do.
Fertilization is internal in reptiles, birds, and mammals.
Internal because they give birth and not lay eggs. If they lay eggs, they would be like a chicken. ~Savannah B.
A bird, reptile, fish, amphibian, or invertebrate. Some mammals come from eggs too.
This is called internal fertilization. It happens in birds and mammals, whereas amphibians emit eggs and sperm to meet in the outside world.
No, a Chameleon is a reptile. Some chameleon species give birth to live young,and the term for this is viviparous. However, they are not mammal because they do not produce milk for their young as all other mammals do.
all animals have eggs, but it depends their fertilization development type (which is either internal or external). Humans are mammals, and all mammals give live birth unless it is a monotreme, which lays eggs.
Actually, not all animals that lay eggs are mammals, and not all mammals give live birth. Some snakes have livebirth(reptile), and the platapus(mammal), lays eggs. But, to answer your question, animal that lay eggs are called reptiles, amphibeans, fish, and birds.
yes of course the baby of mammals develop in eggs inside mother. Here the fertilization will be internal. There are some egg laying mammals also......such as platypus and Pygmy shrew.