Yes. There are many, like iguanas and the extinct iguanodon.
Llama
A leech.
Lionfish.
Lobster
Impala
Impala or Iguana starts with I.
llama
Large-eared pied bat is an animal in Australia. It begins with the letter l.
Cardinal is a bird species. Camel is an animal.
lowing
Eel.
Lion