well if your talking Infectious Diseases then probably none but without regular excercise arthreitis can set in making it difficult for many animals to go about there regular routine.
yes they do , its in their front legs . LOL!
Echidnas have a tiny mouth and a toothless jaw.
No. Sea urchins are animals, which eat algae. They use there spines to make sure no fish eat them, and their mouths are on the bottom of them. They move around on almost invisible legs.
Lots of animals do have legs.
No. All Animals do not have 4 Legs
I believe they are called spurs -- at least in the case of cocks.
The insect you are describing is likely a type of weevil. Weevils have 6 legs, are typically brown in color, and some species have spiky legs due to spines or hairs on their legs.
There are no known animals that have 12 legs. An insect does not have 12 legs, instead it has half, it has six legs.
because we humans walk on our legs and the animals don't have the sort of balance we have
Yes, both sets of a grasshopper's legs have claws. The forelegs, which are adapted for grasping, possess spines and claws that help the grasshopper hold onto surfaces or prey. The hind legs, primarily used for jumping, have spines and claws as well, aiding in grip during movement. This adaptation enhances their ability to navigate their environment effectively.
all you have to do is exercise
Go EXERCISE