vs
QUICK ANSWER
"El" is a form of "el", a definite article which is often translated as "the". "Canguro" is a noun which is often translated as "kangaroo". Learn more about the difference between "el" and "canguro" below.
el(
ehl
)A definite article is a word that identifies a noun as specific or known to the speaker (e.g., the girl).
el canguro(
kahng
-
goo
-
roh
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
1. (animal)
a. kangaroo 
El canguro se alejó dando saltos y pronto había desaparecido entre los árboles.The kangaroo jumped away, and soon it had disappeared among the trees.
a. sling 
Mi bebé se durmió en cuanto lo puse en el canguro.My baby fell asleep as soon as I put him in the sling.
b. baby sling 
¿La llevamos en el carrito o el canguro?Shall we take her in the stroller or the baby sling?
a.  no direct translation
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
Me saco algún dinero extra haciendo canguros.I get some extra money babysitting.
Esta noche no salgo. Tengo un canguro.I won't be going out tonight. I have to babysit.
This means that the noun can be masculine or feminine, depending on the gender of the noun it refers to (e.g., el doctor, la doctora).
a. babysitter 
La canguro llegó tarde y nos perdimos el primer acto de la obra.Our babysitter arrived late, and we missed the first act of the play.