Which of the following pairs of animals has non-glandular skin?

1.  Snake and frog

2.  Chameleon and turtle

3.  Frog and pigeon

4.  Crocodile and tiger

Chameleon and turtle belong to class-Reptilia and possess dry and non-glandular skin with scales,
Frog, pigeon and tiger possess modifications in their skin according to adaptations in their respective habitats.