Cryptic crossword clue
Mammal‘s eggs found beside two rivers 3-4

The most common and most likely answer to this crossword clue is the 8 letter word ROE-DEER

I've seen this crossword clue in Financial Times
R
O
E
-
D
E
E
R

Buddy explains!

The straight part
We know that "Mammal" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case mammal = roe-deer.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does ROE-DEER mean?

ROE-DEER noun
  1. A small, nimble Eurasian deer with no visible tail, a white rump patch, and a reddish summer coat that turns grey in winter, the male having short three-pointed antlers (Capreolus capreolus and Capreolus pygargus).

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