Save Status:
or to save your progress. The page will not refresh.
Controls:
SPACEBAR SWITCHES TYPING DIRECTION
Answer Key:
Edit a Copy:
Make Your Own:
Crossword Word Search Worksheet
Rate This Puzzle:
Log in or sign up to rate this puzzle.

Module 16: Reptiles, etc.

Across
Feathers with smooth barbules but no hooked barbules
A poison that attacks the red blood cells and blood vessels, destroying circulation
Feathers with hooked and smooth barbules, allowing the barbules to interlock
A structure that allows an embryo to be nourished with the mother's blood supply
A shelled, water-retaining egg that allows reptile, bird, and certain mammal embryos to develop on land
The period of time during which an embryo develops before being born
Down
Specialized organs in mammals that produce milk to nourish the young
An organism that is internally warmed by a heat-generating metabolic process
A poison that attacks the nervous system, causing blindness, paralysis, or suffocation