Chet, Navado, and Zinnea. Zinnea is holding on to the tip of Navado's tail, closest to the "camera," which is why she appears to be so big.
To clarify:
Chet- 20 feet long, 6 tons
Navado- 65 feet long, 12 tons (a ton is 2,000 pounds- thanks, Used.).
Zinnea- 3.5 feet long, 40 pounds.
(There will be a background to this.)